Complete resolution of restless legs syndrome following ischemic stroke of the right middle cerebral artery.

Stroke-related restless legs syndrome (sRLS) is an emerging clinical entity, with a clear relationship between stroke and the occurrence of restless legs syndrome (RLS). Dopamine dysregulation has been observed in sRLS of the lenticulostriate region with increased dopamine precursor and decreased dopamine transporter. The aim of this work is to explore an original case of regressive RLS following stroke. Anatomical (MRI) and functional (18F-FDG PET; 18F- FDOPA PET; 123I-FP-CIT SPECT) brain imaging was performed in our patient. A 63 year-old woman experienced complete resolution of longstanding restless legs syndrome (RLS) after a right middle cerebral artery stroke (left faciobrachial sensorimotor deficit), efficiently treated with intravenous thrombolysis. Having had RLS for 14 years, she reported complete symptom relief within four days post-stroke. 2 year follow-up confirmed sustained improvement. In our patient, functional dopaminergic imaging revealed an overall normal dopaminergic tone. This case contradicts the more commonly reported scenario of sRLS where stroke leads to the onset or worsening of RLS. The pathophysiology of RLS remains unclear and in the absence of clear biomarkers for RLS, small lesion models in humans can provide valuable insights to a better understanding of this disease.

The peripheral nerve: A neglected topic in Charcot's neurological work.

Jean-Martin Charcot (1825-1893) did not show much interest in the peripheral nervous system and its associated pathologies. He found it difficult to place the peripheral nerve within his classification of disorders; it appeared to be an exception to his theories. Even the pathology that he described in 1886 with Pierre Marie (1853-1940), at the same time as Henry Tooth (1856-1925), and which is now known as Charcot-Marie-Tooth neuropathy, was considered by Charcot to be a potential myelopathy. Charcot, like other physicians, paid little heed to the observations made by Louis Duménil (1823-1890) to support the existence of primitive damage to the peripheral nerve. Charcot approached peripheral nerve pathologies through two indirect routes: amyotrophies not explained by spinal or muscular damage, and the trophic cutaneous consequences of what he called névrites (neuritis), the lesional site of which remains debated. It is noteworthy that Charcot's approach to peripheral nervous system disorders differed from that of other neurologists of the same time. Augusta Dejerine-Klumpke (1859-1927) in France was more precise than Charcot in her anatomical and clinical descriptions, and Hugo von Ziemssen (1829-1902) in Germany made effective use of electrodiagnostics. Charcot supported the electrical work of Guillaume Duchenne de Boulogne (1806-1875), whom he sometimes presented as one of his mentors. The German physician Wilhelm Erb (1840-1921) developed electrodiagnosis by galvanic and faradic currents. Charcot never made use of Erb's electrological advancements. With his electrophysiologist Romain Vigouroux (1831-1911), Charcot used medical electricity only for electrotherapy in hysteria.

Charcot and Léon Daudet and Charcot: A missed love story?

Biographies, articles, and meetings devoted to the founder of modern neurology, Jean-Martin Charcot, are typically dithyrambic, if not hagiographic. It seems that the striking professional and familial qualities of Charcot have erased any other characteristic of the person, and scratches on the Master image commonly have not been well accepted. With this in mind, it is interesting to present and evaluate the rather negative opinions on Charcot by the famous French writer Léon Daudet, who initially was very close to the Charcots through his father, Alphonse Daudet, and who wrote rather extensively on Charcot in his diary and memoirs. Our point is not to underline these writings as the "truth" about Charcot's personality and life (Daudet, who was a prominent extreme right-wing figure, was known to exaggerate and play with his sharp opinions), but Daudet's criticisms paradoxically provide a fascinating perspective, which may help to reconstruct better who Charcot really was in counterbalancing a bit the overcrowded, politically correct, praising group.

Terminal Care in Parkinson's Disease: Real-Life Use of Continuous Subcutaneous Apomorphine Infusion to Improve Patient Comfort.

BACKGROUND: There are currently no recommendations on the therapeutic management of Parkinson's disease (PD) patients at the end of life. OBJECTIVE: To describe a cohort of patients with PD who benefited from continuous subcutaneous apomorphine infusion (CSAI) initiation at the end of their life as comfort care. METHODS: This real-life cohort includes 14 PD patients, who benefited from 24-h, low-dose CSAI (0.5-3 mg/h) in the context of terminal care. Patient's comfort (pain, rigidity, and/or ability to communicate) and occurrence of CSAI-related side-effects (nausea/vomiting, cutaneous and behavioral manifestations) were evaluated based on medical records. RESULTS: All patients (age 62-94 years, disease duration 2-32 years) presented with late-stage PD and a compromised oral route. Treatment lasted from a few hours to 39 days. CSAI led to substantial functional improvement, with a good safety profile. Overall clinical comfort was deemed improved by the medical team, the patient, and/or caregivers. CONCLUSIONS: CSAI might be a promising approach in PD terminal care, as it reduces motor symptoms and overall discomfort, with an apparent good safety profile. Use of the apomorphine pen, sublingual film or a classic syringe pump might be considered when apomorphine pumps are not available. Larger observational cohorts and randomized controlled trials are needed to establish the efficacy and tolerability of apomorphine in the context of terminal care and more broadly, in an advance care planning perspective.

Are 3D-printed anatomical models of the ear effective for teaching anatomy? A comparative pilot study versus cadaveric models.

PURPOSE: Despite the combination of chalkboard lectures and cadaveric models, the ear remains a complex anatomical structure that is difficult for medical students to grasp. The aim of this study was to evaluate the contribution of a 3D-printed ear model for educating undergraduate medical students by comparing it with a conventional cadaveric model. METHODS: Models of the ear comprising the outer ear, tympanic membrane, ossicles and inner ear were modeled and then 3D-printed at 6:1 and 10:1 scales based on cadaveric dissection and CT, cone-beam CT and micro/nano CT scans. Cadaveric models included two partially dissected dry temporal bones and ossicles. Twenty-four 3rd year medical students were given separate access to cadaveric models (n = 12) or 3D-printed models (n = 12). A pre-test and two post-tests were carried out to assess knowledge (n = 24). A satisfaction questionnaire focusing solely on the 3D-printed model, comprising 17 items assessed on a 5-point Likert scale, was completed by all study participants. A 5-point Likert scale questionnaire comprising four items (realism, color, quality and satisfaction with the 3D-printed ear model) was given to three expert anatomy Professors. RESULTS: The test scores on the first post-test were higher for the students who had used the 3D-printed models (p < 0.05). Overall satisfaction among the students and the experts was very high, averaging 4.7 on a 5-point Likert-type satisfaction scale. CONCLUSION: This study highlights the overall pedagogical value of a 3D-printed model for learning ear anatomy.

Motivational and cognitive predictors of apathy after subthalamic nucleus stimulation in Parkinson's disease.

Postoperative apathy is a frequent symptom in Parkinson's disease patients who have undergone bilateral deep brain stimulation of the subthalamic nucleus. Two main hypotheses for postoperative apathy have been suggested: (i) dopaminergic withdrawal syndrome relative to postoperative dopaminergic drug tapering; and (ii) direct effect of chronic stimulation of the subthalamic nucleus. The primary objective of our study was to describe preoperative and 1-year postoperative apathy in Parkinson's disease patients who underwent chronic bilateral deep brain stimulation of the subthalamic nucleus. We also aimed to identify factors associated with 1-year postoperative apathy considering: (i) preoperative clinical phenotype; (ii) dopaminergic drug management; and (iii) volume of tissue activated within the subthalamic nucleus and the surrounding structures. We investigated a prospective clinical cohort of 367 patients before and 1 year after chronic bilateral deep brain stimulation of the subthalamic nucleus. We assessed apathy using the Lille Apathy Rating Scale and carried out a systematic evaluation of motor, cognitive and behavioural signs. We modelled the volume of tissue activated in 161 patients using the Lead-DBS toolbox and analysed overlaps within motor, cognitive and limbic parts of the subthalamic nucleus. Of the 367 patients, 94 (25.6%) exhibited 1-year postoperative apathy: 67 (18.2%) with 'de novo apathy' and 27 (7.4%) with 'sustained apathy'. We observed disappearance of preoperative apathy in 22 (6.0%) patients, who were classified as having 'reversed apathy'. Lastly, 251 (68.4%) patients had neither preoperative nor postoperative apathy and were classified as having 'no apathy'. We identified preoperative apathy score [odds ratio (OR) 1.16; 95% confidence interval (CI) 1.10, 1.22; P < 0.001], preoperative episodic memory free recall score (OR 0.93; 95% CI 0.88, 0.97; P = 0.003) and 1-year postoperative motor responsiveness (OR 0.98; 95% CI 0.96, 0.99; P = 0.009) as the main factors associated with postoperative apathy. We showed that neither dopaminergic dose reduction nor subthalamic stimulation were associated with postoperative apathy. Patients with 'sustained apathy' had poorer preoperative fronto-striatal cognitive status and a higher preoperative action initiation apathy subscore. In these patients, apathy score and cognitive status worsened postoperatively despite significantly lower reduction in dopamine agonists (P = 0.023), suggesting cognitive dopa-resistant apathy. Patients with 'reversed apathy' benefited from the psychostimulant effect of chronic stimulation of the limbic part of the left subthalamic nucleus (P = 0.043), suggesting motivational apathy. Our results highlight the need for careful preoperative assessment of motivational and cognitive components of apathy as well as executive functions in order to better prevent or manage postoperative apathy.

Trial of Botulinum Toxin for Isolated or Essential Head Tremor.

BACKGROUND: Local injections of botulinum toxin type A have been used to treat essential head tremor but have not been extensively studied in randomized trials. METHODS: In a multicenter, double-blind, randomized trial, we assigned, in a 1:1 ratio, adult patients with essential or isolated head tremor to receive botulinum toxin type A or placebo. Botulinum toxin or placebo was injected under electromyographic guidance into each splenius capitis muscle on the day of randomization (day 0) and during week 12. The primary outcome was improvement by at least 2 points on the Clinical Global Impression of Change (CGI) scale at week 6 after the second injection (week 18 after randomization). The CGI scale was used to record the patient's assessment of the degree of improvement or worsening of head tremor since baseline; scores range from 3 (very much improved) to -3 (very much worse). Secondary outcomes included changes in tremor characteristics from baseline to weeks 6, 12, and 24. RESULTS: A total of 120 patients were enrolled; 3 patients were excluded during screening, and 117 patients were randomly assigned to receive botulinum toxin (62 patients) or placebo (55 patients) and were included in the intention-to-treat analysis. Twelve patients in the botulinum toxin group and 2 patients in the placebo group did not receive injections during week 12. The primary outcome - improvement by at least 2 points on the CGI scale at week 18 - was met by 31% of the patients in the botulinum toxin group as compared with 9% of those in the placebo group (relative risk, 3.37; 95% confidence interval, 1.35 to 8.42; P = 0.009). Analyses of secondary outcomes at 6 and 12 weeks but not at 24 weeks were generally supportive of the primary-outcome analysis. Adverse events occurred in approximately half the patients in the botulinum toxin group and included head and neck pain, posterior cervical weakness, and dysphagia. CONCLUSIONS: Injection of botulinum toxin into each splenius capitis muscle on day 0 and during week 12 was more effective than placebo in reducing the severity of isolated or essential head tremor at 18 weeks but not at 24 weeks, when the effects of injection might be expected to wane, and was associated with adverse events. (Funded by the French Ministry of Health; Btx-HT ClinicalTrials.gov number, NCT02555982.).

3D printing as a pedagogical tool for teaching normal human anatomy: a systematic review.

BACKGROUND: Three-dimensional-printed anatomical models (3DPAMs) appear to be a relevant tool due to their educational value and their feasibility. The objectives of this review were to describe and analyse the methods utilised for creating 3DPAMs used in teaching human anatomy and for evaluating its pedagogical contribution. METHODS: An electronic search was conducted on PubMed using the following terms: education, school, learning, teaching, learn, teach, educational, three-dimensional, 3D, 3-dimensional, printing, printed, print, anatomy, anatomical, anatomically, and anatomic. Data retrieved included study characteristics, model design, morphological evaluation, educational performance, advantages, and disadvantages. RESULTS: Of the 68 articles selected, the cephalic region was the most studied (33 articles); 51 articles mentioned bone printing. In 47 articles, the 3DPAM was designed from CT scans. Five printing processes were listed. Plastic and its derivatives were used in 48 studies. The cost per design ranged from 1.25 USD to 2800 USD. Thirty-seven studies compared 3DPAM to a reference model. Thirty-three articles investigated educational performance. The main advantages were visual and haptic qualities, effectiveness for teaching, reproducibility, customizability and manipulability, time savings, integration of functional anatomy, better mental rotation ability, knowledge retention, and educator/student satisfaction. The main disadvantages were related to the design: consistency, lack of detail or transparency, overly bright colours, long printing time, and high cost. CONCLUSION: This systematic review demonstrates that 3DPAMs are feasible at a low cost and effective for teaching anatomy. More realistic models require access to more expensive 3D printing technologies and substantially longer design time, which would greatly increase the overall cost. Choosing an appropriate image acquisition modality is key. From a pedagogical viewpoint, 3DPAMs are effective tools for teaching anatomy, positively impacting the learning outcomes and satisfaction level. The pedagogical effectiveness of 3DPAMs seems to be best when they reproduce complex anatomical areas, and they are used by students early in their medical studies.

Apathy in Parkinson's Disease: Clinical Patterns and Neurobiological Basis.

Apathy is commonly defined as a loss of motivation leading to a reduction in goal-directed behaviors. This multidimensional syndrome, which includes cognitive, emotional and behavioral components, is one of the most prevalent neuropsychiatric features of Parkinson's disease (PD). It has been established that the prevalence of apathy increases as PD progresses. However, the pathophysiology and anatomic substrate of this syndrome remain unclear. Apathy seems to be underpinned by impaired anatomical structures that link the prefrontal cortex with the limbic system. It can be encountered in the prodromal stage of the disease and in fluctuating PD patients receiving bilateral chronic subthalamic nucleus stimulation. In these stages, apathy may be considered as a disorder of motivation that embodies amotivational behavioral syndrome, is underpinned by combined dopaminergic and serotonergic denervation and is dopa-responsive. In contrast, in advanced PD patients, apathy may be considered as cognitive apathy that announces cognitive decline and PD dementia, is underpinned by diffuse neurotransmitter system dysfunction and Lewy pathology spreading and is no longer dopa-responsive. In this review, we discuss the clinical patterns of apathy and their treatment, the neurobiological basis of apathy, the potential role of the anatomical structures involved and the pathways in motivational and cognitive apathy.

[Anatomy of memory]. / Anatomie de la mémoire.

ANATOMY OF MEMORY. Memory phenomena involve neuron circuits and neurogenesis processes at the microscopic level. Nevertheless, the central role played by some key structures such as the hippocampus and the limbic lobe requires a good knowledge of their macroscopic anatomy. This article summarizes an overview of the anatomical organization of these structures and of their abundant connections.

ANATOMIE DE LA MÉMOIRE. Les phénomènes mnésiques mettent en jeu à l'échelle microscopique des circuits neuronaux et des processus de neurogenèse. Néanmoins, le rôle central joué par certaines structures clés comme l'hippocampe ou le lobe limbique impose une bonne connaissance de leur anatomie macroscopique. Cet article propose une synthèse de l'organisation anatomique de ces structures et de leurs riches connexions.

Human amniotic membrane application in oral surgery-An ex vivo pilot study.

Objectives: The purpose of this pilot porcine study was to explore and illustrate the surgical application of human amniotic membrane (hAM) in an ex vivo model of medication-related osteonecrosis of the jaw (MRONJ). Material and methods: Five oral and maxillofacial surgeons participated to this study. MRONJ was simulated on porcine mandible specimens. hAM was applied using four different techniques: implantation with complete coverage, implantation with partial coverage, apposition and covering graft material. At the same time, the surgeons evaluated how well the hAM handled and its physical properties during the surgery. Results: Surgeons found that hAM had suitable mechanical properties, as it was easy to detach from the support, handle, bind to the defect and bury. hAM was also found to be strong and stable. The "implantation with complete coverage" and "implantation with partial coverage" techniques were the preferred choices for the MRONJ indication. Conclusion: This study shows that hAM is a graft material with suitable properties for oral surgery. It is preferable to use it buried under the gingiva with sutures above it, which increases its stability. This technical note aims to educate surgeons and provide them with details about the handling of hAM in oral surgery. Clinical relevance: Two surgical techniques for hAM application in MRONJ were identified and illustrated. hAM handling and physical properties during surgery were reported.

Beasts and Gods: Hippocampal quarrels before memory.

The first description and naming of the hippocampus is usually credited to Arantius (c. 1530 - 1589), whose comparison of the swelling inside the temporal horn of the lateral ventricle to a seahorse (hippocampus) or silkworm (bombyx) was published in the 1587 edition of the Anatomicarum Observationum Liber. However, in the 17th century, the term hippocampus was rarely used and its precise anatomy remained a mystery. The 18th century saw the hippocampus referred to as a wide range of animals and divinities. These terminological issues provoked heated discussions in the French Académie Royale des Sciences, culminating in the seminal description of the hippocampus in the 1780s by Félix Vicq d'Azyr (1748-1794). However, it is striking that no hypothesis concerning the function of the hippocampus was proposed, and its link with memory was not established until the mid-20th century.

Treatments in Neurology: The Winding Road from 1897 to 2022.

BACKGROUND: For many years, neurology was seen as a purely observational discipline, focused on pathology and with little interest in treatments. SUMMARY: From the creation in 1897 of Monatsschrift für Psychiatrie und Neurologie, the forebear of European Neurology, to nowadays, there have been great changes in the paradigms and concepts of treatments in neurology. We present an overview of the evolution of neurological treatments from 1897 to 2022. KEY MESSAGES: However, the last 125 years have not consisted of constant progress. The exceptional advances made in some diseases (multiple sclerosis or surgical treatment of Parkinson's disease) cannot hide the stagnation in others (certain brain tumors or amyotrophic lateral sclerosis).

[Neurological shoulder pain and weakness : practical attitudes]. / Douleurs et faiblesse de l'épaule neurologique : attitudes pratiques.

Shoulder pain or paresis should be assessed carefully, as there are many possible causes, which can be osteoarticular, degenerative, inflammatory, or neurological. Weakness or pain can be related to cervicobrachialgia, plexitis, or focal mononeuropathy. The clinical picture should identify any muscular or mechanical origin of paresis responsible for pseudo-paretic functional limitation. Neurogenic scapulalgia with functional deficit implies the compression or entrapment of a nerve trunk including the axillary, long thoracic, accessory, suprascapular, or dorsal scapular nerves. Nerve conduction study and myography together with medical imaging help to identify the relevant etiology. Treatment mostly includes pain relief and physiotherapy, but surgery is rarely necessary.

L'épaule douloureuse ou parétique est d'appréhension délicate et de causes variées : ostéoarticulaire, dégénérative, inflammatoire ou neurologique. La faiblesse ou la douleur peuvent être liées à une cervicobrachialgie, une plexite ou une mononeuropathie focale. Le tableau clinique doit distinguer une parésie d'origine musculaire ou mécanique responsable alors d'une limitation fonctionnelle pseudo-parétique. Une scapulalgie déficitaire neurogène implique la recherche d'une mononeuropathie d'enclavement ou compressive d'un tronc nerveux, axillaire, long thoracique, accessoire du XIe nerf crânien, suprascapulaire ou dorsal de la scapula. Au besoin l'ENMG (électroneuromyogramme)et l'imagerie débrouilleront les multiples étiologies. Le traitement requiert le plus souvent une antalgie et une rééducation, rarement une chirurgie.

Quantification of Head Tremors in Medical Conditions: A Comparison of Analyses Using a 2D Video Camera and a 3D Wireless Inertial Motion Unit.

This study compares two methods to quantify the amplitude and frequency of head movements in patients with head tremor: one based on video-based motion analysis, and the other using a miniature wireless inertial magnetic motion unit (IMMU). Concomitant with the clinical assessment of head tremor severity, head linear displacements in the frontal plane and head angular displacements in three dimensions were obtained simultaneously in forty-nine patients using one video camera and an IMMU in three experimental conditions while sitting (at rest, counting backward, and with arms extended). Head tremor amplitude was quantified along/around each axis, and head tremor frequency was analyzed in the frequency and time-frequency domains. Correlation analysis investigated the association between the clinical severity of head tremor and head linear and angular displacements. Our results showed better sensitivity of the IMMU compared to a 2D video camera to detect changes of tremor amplitude according to examination conditions, and better agreement with clinical measures. The frequency of head tremor calculated from video data in the frequency domain was higher than that obtained using time-frequency analysis and those calculated from the IMMU data. This study provides strong experimental evidence in favor of using an IMMU to quantify the amplitude and time-frequency oscillatory features of head tremor, especially in medical conditions.

Lower Cranial Nerve Palsies in the COVID-19 Pandemic: A 10-Case Series of Intensive Care Unit Patients.

INTRODUCTION: A number of neurological complications of COVID-19 have been identified, including cranial nerve paralyses. We present a series of 10 patients with lower cranial nerve involvement after severe COVID-19 infection requiring hospitalization in an intensive care unit. METHODS: We conducted a retrospective, observational study of patients admitted to the post-intensive care unit (p-ICU) of Besançon University Hospital (France) between March 16 and May 22, 2020. We included patients with confirmed COVID-19 and cranial neuropathy at admission to the p-ICU. All these patients were treated by orotracheal intubation, and all but one underwent prone-position ventilation therapy. RESULTS: Of the 88 patients admitted to the p-ICU, 10 patients (11%) presented at least 1 cranial nerve palsy. Of these 10 patients, 9 had a hypoglossal nerve palsy and 8 of these also had a deficit in another cranial nerve. The most frequent association was between hypoglossal and vagal palsies (5 patients). None of the patients developed neurological signs related to a global neuropathy. We found no correlation between the intensity of the motor limb weakness and the occurrence of lower cranial nerve palsies. All but 2 of the patients recovered within less than a month. CONCLUSION: The mechanical compressive hypothesis, linked to the prone-position ventilation therapy, appears to be the major factor. The direct toxicity of SARS-CoV-2 and the context of immune dysfunction induced by the virus may be involved in a multifactorial etiology.

Stroke-related restless legs syndrome: Clinical and anatomo-functional characterization of an emerging entity.

BACKGROUND AND PURPOSE: Stroke-related restless legs syndrome (sRLS) secondary to ischemic lesions is an emerging entity and an interesting condition, but there are limited available data to help us further understand its underlying pathways. In this study, we characterized sRLS clinically, neuroanatomically and functionally. METHODS: Consecutive patients hospitalized in the Stroke Unit of the University Hospital of Strasbourg were assessed clinically and electrophysiologically for sRLS characteristics. They underwent brain magnetic resonance imaging for the neuroanatomical study of involved structures, and received functional evaluations with 18 F-FDG (2-deoxy-2-[fluorine-18]fluoro-D-glucose) positron emission tomography (PET) for glucose consumption, 123 I-FP-CIT ([123]I-2beta-carbometoxy-3beta-[4-iodophenyl]-N-[3-fluoropropyl]nortropane) single-photon emission computed tomography for dopamine reuptake and PET with 18 F-FDOPA ((3,4-dihydroxy-6-[18]F-fluoro-l-phenylalanine) for presynaptic dopaminergic synthesis. RESULTS: Sixteen patients with sRLS, eight women and eight men, aged 41-81 years, were included. The clinical characteristics of sRLS and idiopathic RLS were similar. Most patients presented with bilateral and symmetric de novo RLS. Eight patients had infarction in the lenticulostriate area (middle cerebral artery and internal carotid arteria). The body of the caudate nucleus was most commonly affected. Seven patients had sRLS secondary to ventral brainstem infarction (perforating branches of the basilar arteria) affecting the pons in six patients and the medulla oblongata in one patient. Both the corticospinal tract and the cortico-pontocerebellar fibres were lesioned in all patients with brainstem stroke. One patient had infarction in the left posterior cerebellar vermis and occipital area (posterior cerebral artery and superior cerebellar artery). Isotopic explorations showed a significantly increased dopaminergic tone in the striatum ipsilateral to lenticulostriate infarction. Dopamine fixation was normal in patients with stroke outside of the lenticulostriate area. CONCLUSIONS: Clinicians should be aware of the characteristics of sRLS for the appropriate diagnosis and treatment of this condition.

Anatomo-sonographic identification of the longissimus capitis and splenius cervicis muscles: principles for possible application to ultrasound-guided botulinum toxin injections in cervical dystonia.

OBJECTIVE: The main objective of this study was to define and verify anatomo-sonographic landmarks for ultrasound-guided injection of botulinum toxin into the longissimus capitis (LC) and splenius cervicis (SC) muscles. METHODS AND RESULTS: After a preliminary work of anatomical description of the LC and SC muscles, we identified these muscles on two cadavers and then on a healthy volunteer using ultrasound and magnetic resonance imaging (MRI) to establish a radio-anatomical correlation. We defined an anatomo-sonographic landmark for the injection of each of these muscles. The correct positioning of vascular glue into the LC muscle and a metal clip into the SC muscle of a fresh cadaver as verified by dissection confirmed the utility of the selected landmarks. DISCUSSION: For the LC muscle, the intramuscular tendon of the cranial part of the muscle appears to be a reliable anatomical landmark. The ultrasound-guided injection can be performed within the cranial portion of the muscle, between the intra-muscular tendon and insertion into the mastoid process at dens of the axis level. For the SC muscle, the surface topographic landmarks of the spinous processes of the C4-C5 vertebrae and the muscle body of the levator scapulae muscle seem to be reliable landmarks. From these, the ultrasound-guided injection can be carried out laterally by transfixing the body of the levator scapulae. CONCLUSION: The study defined two cervical anatomo-sonographic landmarks for injecting the LC and SC muscles.