Glossopharyngeal, Vagus and Accessory Nerves: Anatomy and Pathology.

The glossopharyngeal, vagus, and accessory nerves are discussed in this article, given their intimate anatomical and functional associations. Abnormalities of these lower cranial nerves may be intrinsic or extrinsic due to various disease processes. This article aims to review these nerves' anatomy and demonstrates the imaging aspect of the diseases which most commonly affect them.

Schwannoma del glosofaríngeo: reporte de caso clínico / Glossopharyngeal schwannoma: Clinical case report

Los schwannomas del nervio glosofaríngeo son tumores de la fosa posterior extraordinariamente raros. En una revisión de 100 años se encontró un total de 42 casos entre 1908-2008. Los datos clínicos más comunes se encuentran asociados a su localización, siendo los más comunes síntomas vestíbulo cocleares y síntomas de afectación de la función del nervio glosofaríngeo. Su diagnóstico actualmente se ha facilitado con el uso de la resonancia magnética; sin embargo, es muy complicado definir en ocasiones preoperatoriamente si el tumor se origina del ix, x u xi nervios craneales. Presentamos el caso de una paciente de 42 años con síndrome del ángulo pontocerebeloso, síndrome del agujero rasgado posterior (yugular) + condileo anterior (Collet-Sicard). El tratamiento empleado fue quirúrgico con abordaje extremo lateral transcondilar, con monitorización de pares craneales y potenciales evocados transoperatorios

Schwannomas of the glossopharyngeal nerve are extremely rare tumors of the posterior fossa. In a 100-year review, a total of 42 cases were found between 1908-2008. The most common clinical data are associated with its location, the most common being cochlear vestibule symptoms and symptoms of glossopharyngeal nerve function. its diagnosis has now been facilitated by the use of magnetic resonance, however, it is very complicated to define preoperatively if the tumor originates from the ix, x or xi NC. We present the case of a 42-year-old patient with a syndrome of angulopentocerebellar syndrome, posterior torn (jugular) hole syndrome + anterior condyle (Collet-Sicard). The treatment used was surgical with transcondylar lateral extreme approach, with monitoring of cranial nerves and trans-operative evoked potentials

Treatment of syncope in tongue cancer with palliative chemotherapy in the intensive care unit: A case report.

RATIONALE: Syncope caused by head and neck cancer (HNC) is rare. However, syncope caused by tongue cancer (TC) is even rarer. In TC, syncope is caused by tumor-mediated compression of the carotid sinus and stimulation of the glossopharyngeal nerve. PATIENT CONCERNS: In this study, we report the case of a 48-year-old male patient who was diagnosed with advanced TC and bilateral cervical lymph node metastasis. On the third day of admission, the patient experienced recurrent syncope with hypotension and bradycardia. DIAGNOSES: The patient was diagnosed with a well-differentiated squamous cell carcinoma of the tongue along with massive cervical lymph node metastasis and carotid sinus syndrome. INTERVENTIONS: Initially, symptomatic treatment of syncope boosted the blood pressure and increased the heart rate. Thereafter, a temporary pacemaker was implanted. Finally, chemotherapy was used to control the tumor and relieve syncope. OUTCOMES: After chemotherapy, the tongue ulcers and cervical lymph node reduced in size; syncope did not recur. LESSONS: This case shows that chemotherapy may be a valid treatment option in patients with cancer-related syncope; however, the choice of chemotherapeutic drugs is critical. Intensive care provides life support to patients and creates opportunities for further treatment.

Meningeal Architecture of the Jugular Foramen: An Anatomic Study Using Plastinated Histologic Sections.

OBJECTIVE: This 3-dimensional histologic study aimed to provide a precise description of the meningeal structures in the jugular foramen. METHODS: 22 posterior skull base tissue blocks containing the jugular foramen region were obtained from 11 human cadaveric heads. These blocks were plastinated and cut into serial sections. After staining, these sections were examined under an optical microscope and used to reconstruct a 3-dimensional visualization model. RESULTS: At the intracranial orifice of the jugular foramen, the meningeal dura formed 2 separate dural perforations: the glossopharyngeal meatus and the vagal meatus. The arachnoid extended into 2 dural meatuses and terminated at the inferior ganglion of the glossopharyngeal nerve in the glossopharyngeal meatus and the superior ganglion of the vagus nerve in the vagal meatus. At the intraforaminal part of the jugular foramen, the meningeal dura encased the glossopharyngeal nerve to form a dural sheath while encasing the vagus and accessory nerves to form a dural network. At the extracranial orifice of the jugular foramen, the dural wall of the jugular bulb extended downward to form a dense connective tissue sheath. The initial end of the internal jugular vein invaginated into this sheath and fused with the jugular bulb. CONCLUSIONS: Knowledge of the anatomy of the meningeal architecture of the jugular foramen can be helpful in avoiding surgical complications of the lower cranial nerves when this complex area is approached.

Carotid Sinus Nerve: A Comprehensive Review of Its Anatomy, Variations, Pathology, and Clinical Applications.

The carotid sinus nerve branches off the glossopharyngeal nerve just after its appearance from the jugular foramen, descends along the internal carotid artery, and enters the carotid sinus. There have been many studies of the pathway and the course of the carotid sinus nerve and its communications with surrounding nerves. The intercommunication is exceedingly complicated. Acknowledgment of its anatomic diversity can be important in specific operations dealing with this area. Herein we review the anatomy, variations, pathology, and clinical applications of the carotid sinus nerve.

Glossopharyngeal Neuralgia with Syncope Caused by Recurrence of Esophageal Squamous Cell Carcinoma.

We herein report a case of glossopharyngeal neuralgia with repeated syncope caused by the recurrence of esophageal carcinoma. The typical symptoms of glossopharyngeal neuralgia are paroxysmal, stabbing, electric shock-like pain in the pharynx and/or base of the tongue on swallowing and talking. In addition, syncope can also be caused by glossopharyngeal neuralgia. The diagnosis of glossopharyngeal neuralgia is not always easy because of its rarity. In the present case, we suspected that repeated syncope was caused by glossopharyngeal neuralgia due to the recurrence of esophageal carcinoma. Concurrent chemoradiation therapy was effective in reducing the tumor size, which resulted in the complete resolution of the symptoms.

Bilateral taste disorders in patients with Ramsay Hunt syndrome and Bell palsy.

OBJECTIVE: Ramsay Hunt syndrome (RHS) and Bell palsy (BP) are typically known as facial nerve motor syndromes and are primarily unilateral. The aim of this study was to challenge this assertion, because both conditions are also known to be associated with viruses that typically affect several nerves. METHODS: Ten participants with RHS, 12 with BP, all clinically unilateral, and 12 healthy controls were prospectively enrolled. Electrogustometric thresholds were measured bilaterally in the areas of the chorda tympani, the glossopharyngeal, and the major petrosal nerve. Also bilaterally, the taste function was tested using chemogustometry with different tastant concentrations. Again bilaterally, the morphology of the mucosa and the vessels of the anterior fungiform papillae were examined by contact endoscopy. Statistically, RHS and BP participants were compared with the healthy controls, and the paretic sides of RHS and BP were compared pairwise with their mobile sides. RESULTS: Electrogustometrically, perception was reduced bilaterally in RHS (10-19dB, p < 0.001) and BP (3-5dB, p = 0.011-0.030) in all 3 innervation areas. Chemogustometrically, it was also reduced bilaterally in RHS (20-70%) and BP (8-50%). Papillary atrophies were increased 100% in RHS (p = 0.001) and BP (p < 0.001). They were more increased on the paretic side in RHS (30%, p = 0.078) and BP (83%, p < 0.001). INTERPRETATION: In these 2 clinically unilateral conditions, the gustatory perception and morphology are bilaterally affected, more in RHS and more on the paretic side. BP, known as an isolated motor condition, appears to be a cranial polyneuritis. A bilateral examination and therapeutic gustatory monitoring might follow these observations in evidence-based practice. Ann Neurol 2018;83:807-815.

A New Determinant of Poor Outcome After Spontaneous Subarachnoid Hemorrhage: Blood pH and the Disruption of Glossopharyngeal Nerve-Carotid Body Network: First Experimental Study.

OBJECTIVE: The chemoreceptor network, consisting of the glossopharyngeal nerve and carotid body (GPN-CB), is essential for the regulation of blood pH. Its ischemic insults after subarachnoid hemorrhage (SAH), which may contribute to acidosis, have not been investigated. METHODS: Twenty-three hybrid rabbits were used. They were divided into 3 groups: 5 as a control group, 5 as a sham group, and the remaining 13 as the study group. Injections included 1 cm3 serum saline and 1 cm3 autolog arterial blood into the cisterna magna in the sham and study group, respectively. Blood pH values of all animals were recorded. After 2 weeks, animals were euthanized. The number of normal and degenerated neurons of the carotid bodies (CBs) was counted by stereologic methods and analyzed statistically. RESULTS: Two of 13 rabbits died within the second week. The mean blood pH values were measured as 7.35 ± 0.07 in the control group (n = 5), 7.33 ± 0.06 in the sham group (n = 5), 7.29 ± 0.05 in rabbits with slight acidosis (n = 6), and 7.23 ± 0.02 in rabbits with prominent acidosis (n = 7). In the control group, the average normal neuronal density of the CBs was 6432 ± 790/mm3 and the degenerated neuron density was 11 ± 3/mm3, whereas the degenerated neuronal density in CBs was 35 ± 8/mm3 in the sham group and 1034 ± 112/mm3 in the slight acidosis-developed group (n = 6; P < 0.05). Conversely, degenerated neuron density of CBs was 2134 ± 251/mm3 in the prominent acidosis-developed animals (n = 7; P < 0.005). Interestingly, in the rabbits who died, the degenerated neuron density of the CB was 3160 ± 840/mm3. CONCLUSION: An inverse relationship between neurodegeneration in the CB and pH values secondary to the disruption of the GPN-CB network after SAH was found, which may contribute to developing acidosis.

Morphological relationship between the superior cervical ganglion and cervical nerves in Japanese cadaver donors.

INTRODUCTION: There are various communications between the superior cervical ganglion (SCG) and the vagus and glossopharyngeal nerves. However, little information exists concerning the origin of these sympathetic ganglion branches at the superior, middle, and inferior regions of the human SCG. The aim of this study was to describe the human SCG in a morphometric manner with the communication with cranial and cervical nerves and supply. METHODS: This study characterized 72 SCG samples from 54 elderly Japanese human cadavers (30 males, 24 females; 65-100 years old). The SCG size (length, width, and thickness) and location were measured from the jugular foramen. We also defined the communication branches of the SCG to the vagus, glossopharyngeal, cervical, and accessory nerves at three regions (superior, middle, and inferior regions) of the SCG. Finally, we examined the arrangement and origin of the branch communications in detail and confirmed our observations, using histological sections of the SCG. RESULTS: The SCG in all cadaver donors was detected at the C2 and C3 vertebra levels. The number of SCG branches supplied the communicating branches, such as the carotid branch, communicating branch of the vagus nerve, and glossopharyngeal nerve, were frequently detected in the superior region of the SCG (χ2 = 587.72, df = 26, p < .001). The number of ganglion cells with a large number of neurons per unit area (1 mm2) was most often found in the middle region with shrunken neurons of the SCG compared with other regions. CONCLUSION: The communication branches of the SCG are mainly connected to the vagus and glossopharyngeal nerves. Characterizing these branches can provide useful data for head and neck ganglion block and surgical treatments.

Glossopharyngeal neuralgia associated with cardiac syncope.

Glossopharyngeal neuralgia is a rare pain syndrome presenting with paroxysms of pain in the region of the glossopharyngeal nerve. Even more uncommon is the association between glossopharyngeal neuralgia and cardiac syncope. In these patients, the cardiovascular consequences may include bradycardia, hypotension and cardiac arrest. We describe the case of a 40-year-old patient who presented with this rare association of glossopharyngeal neuralgia and syncope. Multiple pauses including one lasting 14 s were noted on ambulatory ECG monitoring. In this case, the patient declined pharmacological treatment with carbamazepine or with permanent pacing and so far has been in remission from symptoms for 3 months.

Seizures with an atypical aetiology in an elderly patient: Eagle's syndrome--how does one treat it?

Onset of epilepsy can occur at any age, but it is relatively rare in the elderly. Late onset epilepsy is usually secondary to stroke, tumour, trauma or neurodegenerative disorders. A 62-year-old Indian woman presented with frequent drop attacks sometimes leading to unconsciousness and, rarely, associated with seizure. Her epilepsy work up was unremarkable. As the disease progressed, she was diagnosed as having idiopathic epilepsy, syncope or pseudo-seizure, on different occasions, and was treated at length with no response. Finally, detailed history-taking revealed her as having glossopharyngeal neuralgia leading to syncope and seizures. She subsequently improved. In clinical practice, such rare entities should also be considered for proper management of patients' ailments.

Relapse with Dysphagia in a Case of Chronic Inflammatory Demyelinating Polyradiculoneuropathy.

Glossopharyngeal and/or vagus nerve involvement is infrequent in patients with chronic inflammatory demyelinating polyradiculoneuropathy (CIDP). We herein report the case of a 69-year-old Japanese woman who presented with muscle weakness and numbness of the extremities with dysphagia. The serum anti-ganglioside GM1 immunoglobulin IgM antibody levels were elevated, and treatment with intravenous immunoglobulin (IVIg) resulted in a dramatic improvement; the weakness, numbness and dysphagia all resolved. However, relapse comprising dysphagia alone occurred on hospital day 26, and treatment with IVIg again proved extremely effective. IVIg therapy can be effective against cranial nerve involvement in cases of CIDP.

Orofacial pain after invasive dental procedures: neuropathic pain in perspective.

BACKGROUND: The neurologist is very familiar with the painful neuropathies of the trunk and extremities but, generally, to a lesser extent with those of the head and face. Of the latter, the neurologist is particularly familiar with ophthalmic zoster and trigeminal neuralgia. REVIEW SUMMARY: This review deals with neuropathic orofacial pain: (1) to highlight its presentation; and (2) to contrast it with that of neuropathic pain elsewhere in the body, including the head, from which it seems to differ significantly. The reason for the difference is also discussed as well as its implications for the diagnosis of orofacial pain as neuropathic. In the cases of neuropathic orofacial pain presented, the pain followed invasive dental procedures, making it relatively homogenous in terms of its etiology. The cases are contrasted with those of cranial nonorofacial and of noncranial painful neuropathy. CONCLUSIONS: It is suggested that the presence of abnormal sensory responses to touch, in the sense of paresthesia, dysesthesia, or allodynia, is a prerequisite for the diagnosis of neuropathic pain, when other, motor or sensory, signs of nerve injury ordinarily guiding the diagnosis are lacking, as is often the case in the face.

[A post-styloid mass revealing a parapharyngeal schwannoma]. / Une masse rétro-stylienne révéatrice d'un schwannome parapharyngé.

INTRODUCTION: The schwannoma of the glossopharyngeal nerve is a rare etiology among the tumor masses developed in the parapharyngeal space. CASE REPORT: We report the case of a 33 years old woman in whom a large schwannoma of the left glossopharyngeal nerve was discovered incidentally on a brain MRI. Respiratory evolutionary prognosis imposed trans-oral surgical treatment. DISCUSSION: We discuss the diagnostic and therapeutic strategy for the benign tumors of the parapharyngeal space. CONCLUSION: The schwannoma of the glossopharyngeal nerve is a benign rare lesion. The difficulty lies on the surgical strategy and the choice of the approach. The functional suites are marked by difficulty swallowing and require intensive speech therapy.

[Glossopharyngeal neuralgia and syncope]. / Een man met glossopharyngeusneuralgie en syncope.

BACKGROUND: The causes of neuralgia are usually not known, but the condition can be caused by an underlying condition. CASE DESCRIPTION: A 58-year-old man presented at the accident and emergency department with a 6-week history of continuous nagging pain in the region of his right ear, extending to the lower jaw and the right side of his neck; this worsened in progressive attacks, which were sometimes followed by non-rotatory dizziness and loss of consciousness. This clinical picture lead us to suspect glossopharyngeal neuralgia (GPN) because of the distribution of the pain and the secondary syncope, but the continuous nature of the pain was atypical and a reason for further investigation. This revealed metastatic parotid gland carcinoma with compression of the right glossopharyngeal nerve. Following palliative radiotherapy, the pain improved and there were no further episodes of loss of consciousness. CONCLUSION: When GPN is suspected and there is continuous pain, or neurological investigations reveal abnormalities, an underlying condition should be considered and additional investigations should be carried out.

Large middle ear schwannoma of the Jacobson's nerve with intracranial extension.

The patient is a 64-year-old woman who developed a sensation of right ear fullness and hearing loss in early November 2010. Physical examination revealed a painless reddish granular lesion filling in the right external auditory canal. Her right ear was deaf, and no facial palsy was noted. Computed tomography, magnetic resonance imaging and positron emission tomography revealed a middle ear mass extending to the external auditory canal with intracranial invasion causing temporal lobe retraction and inferiorly extending just anterior to the jugular bulb as well. A combination of transmastoid and middle cranial fossa approach along with anterior rerouting of the facial nerve was employed for a near-total removal of the tumor. Based upon the operative findings, it was deemed that the tumor could have arisen from the Jacobson's nerve.

Changes in number of water-filled vesicles of choroid plexus in early and late phase of experimental rabbit subarachnoid hemorrhage model: the role of petrous ganglion of glossopharyngeal nerve.

BACKGROUND: Cerebrospinal fluid (CSF) secretion may be increased in the early phases of subarachnoid hemorrhage (SAH), possibly via ischemic glossopharyngeal nerve discharges, and decreased due to glossopharyngeal nerve degeneration in the late phase of SAH; but this reflex pathway has not been definitively investigated. We studied the relationship between petrous ganglion of the glossopharyngeal nerve (GPN) and water vesicles of the choroid plexus (CP) in the early and late phases of SAH. METHODS: This study was conducted on 30 rabbits, divided into four groups, with five rabbits in the control group (group I), five rabbits in the sham group (Group II), and 20 rabbits in the SAH group. In the SAH group, five of the animals were decapitated after 4 days of cisternal blood injections (Group III), and the other 15 animals were decapitated after 20 days of injections (Group IV). The Petrous Ganglia and CPs of lateral ventricles were removed and stained for stereological analysis. RESULTS: The mean number of follicles per cubic millimeter was 5.3 ± 1.2 the in control group (Group I), 4.5 ± 0.9 in the sham group (Group II), 16.60 ± 3.77 the in early decapitated group (Group III), and 4.30 ± 0.84 in the late decapitated group (Group IV). The mean number of degenerated neuron density of petrous ganglions was 6 ± 2, 50 ± 6, 742 ± 96, and 2.420 ± 350 in the control (Group I), sham (Group II), early decapitated (Group III), and late decapitated group (Group IV), respectively. The mean number of water vesicles was statistically different after SAH between the early decapitated group (group III) and the late decapitated group (group IV) (P < 0.05). CONCLUSIONS: We studied the relationship between petrous ganglion cells of the GPN and water vesicles of CP in the early and late phases of SAH, and found that CP vesicles are increased in the early phase of SAH due to irritation of GPN, and decreased in the late phase due to ischemic insult of the petrous ganglion and parasympathetic innervation of the CP.