Accessory head of the extensor carpi radialis longus muscle merging with extensor carpi radialis brevis muscle.

PURPOSE: The retention and capture functions of hand can be achieved by the consistent manner work of the extensor and flexor muscles. Therefore, it is important to know variations of the extensor and flexor muscles. METHODS: During an educational dissection, accessory heads of the extensor carpi radialis longus muscle were found on the right side in a Korean cadaver. RESULTS: The extensor carpi radialis longus muscle was originated from the lateral supracondylar ridge of the humerus and trifurcated into three heads as lateral, intermediated, and medial heads. The lateral and intermediated heads merged and inserted to the base of the second metacarpal bone. However, medial head of extensor carpi radialis longus muscle was merged with the extensor carpi radialis brevis muscle. CONCLUSIONS: Knowledge of the variations of the ECRL is important for surgeons because the presence of the ECRL variations increases the incidence of iatrogenic injuries during surgery and invasive procedures.

Topographical relations between the Gantzer's muscle and neurovascular structures.

PURPOSE: Gantzer's muscle (GM) is an additional muscle in the forearm, which develops as an accessory head of the flexor pollicis longus or the flexor digitorum profundus. The study aimed to determine the topography of the GM and to define the topographical relationship between the GM and the neurovascular structures surrounding it. METHODS: After confirming the presence of GM, its topography and the neurovascular structures were analyzed to determine the correlation between them in 73 upper limbs. RESULTS: The incidence of GM was 47.95% (35/73) and the average insertion point of GM was identified at 49.33 ± 7.47‰ (119.82 ± 20.80 mm) on the reference line between the medial epicondyle and the pisiform bone. And the branching points of the median nerve and the ulnar artery were located 19.91 ± 11.23‰ (52.21 ± 24.67 mm), 17.45 ± 8.39‰ (42.53 ± 20.54 mm) on the reference line, respectively. The presence of GM had no significant correlation with the position of the nerve branches. On the other hand, the branching point of the ulnar artery was distally located in the cases with the presence of the GM (17.35 ± 8.65 vs 19.42 ± 10.87, p = 0.031). There was a significant positive correlation between the point of arterial bifurcation and the length of the GM (r = 0.407, p = 0.015). CONCLUSIONS: This study suggested that the GM has a topographical relation with the arterial structures, perhaps for embryological reasons.

The ileocolic vein passing through the ring-shaped part of ileocolic artery.

PURPOSE: The purpose of this case report is to report vascular variations in the abdomen because of its clinical importance for the surgeries like acute abdominal emergencies and symptomatic aneurysms. Here, we report an extremely rare case with an ileocolic vein passing through the annulus of the ileocolic artery. METHODS: During the routine dissection, we found an ileocolic vein perforating through a ring-shaped ileocolic artery. RESULTS: A ring-shaped ileocolic artery was originating from the superior mesenteric artery as a single branch. After forming the circle, it maintained the regular branching patterns. The ileocolic vein was drained from the ascending colon, cecum, appendix and the distal part of the ileum and passed the center of the ring-shaped part of the ileocolic artery from posterior to anterior. Other structures of the abdomen were normal. CONCLUSIONS: We reported this rare variation and suggest that the clinicians should be aware of this variation for succeeding surgery and making a good diagnosis for the patients.

Topography and Anatomical Variations of the Axillary Artery.

Knowledge of anatomical variations of the limb's main arteries is significant for the clinicians. Thus, this study is aimed at examining the branching pattern and anatomical variations of the axillary artery. We conducted research on 59 upper limbs of adult human donated cadavers. All axillary artery branches' origins were assessed, and the correlations between points of origins and variations of specific branches were evaluated. The average length of the axillary artery was found to be 11.22 cm, and this length was defined as reference line. Based on this reference line, the first, second, and third parts were 37.56%, 39%, and 30.05%, respectively. The STA was originated from 25.11%. The TAA and LTA were 42.67% and 54.82%, respectively. The SSA, ACHA, and PCHA were 64.72%, 83.89%, and 84.53%, respectively. The origin of LTA was correlated with that of SSA (R = 0.473, P < 0.05) and AHCA (R = 0.307, P < 0.05), respectively. And there was a positive correlation between AHCA and PHCA (R = 0.705, P < 0.05). The number of branches ranged from 3~6, and 9 types were shown. The most frequent branching pattern was common origin of the LTA and SSA (22/59). And AHCA and PHCA were originated together in 19 cases, and both patterns were combined in 12 cases. TTA and LTA branched together in 9 cases, and common trunk for the SSA, PHCA, and AHCA was found in 2 cases. According to this pattern, the origin of LTA and PCHA was significantly different. This information is particularly useful for surgeons and clinicians.

Tracheal compression by aberrant brachiocephalic trunk accompanying variant origin of the vertebral artery / Compresión traqueal por un tronco braquiocefálico aberrante acompañado de una variación en el origen de la arteria vertebral

The aorta is the main arterial trunk in the human body, however, its variation was extremely variable. During an educational dissection, aberrant branching pattern of aortic arch was found in a Korean cadaver. The brachiocephalic trunk (innominate artery) originated from the aortic arch at the left side of the trachea. It crossed the trachea and divided into the right common carotid and subclavian arteries. The left vertebral artery originated from the aortic arch between the origins of the left common carotid artery and the left subclavian artery, then the left vertebral artery coursed upward to the transverse foramen of the C7. The author describes this previously novel case report with aberrant brachiocephalic trunk and left vertebral arteries and discusses the clinical implications of such a variant.

La aorta es el tronco arterial principal del cuerpo humano, sin embargo, su variación es extremadamente variable. Durante una disección de rutina de un cadáver coreano, se encontró un patrón de ramificación aberrante del arco aórtico. El tronco braquiocefálico se originaba del arco aórtico en el lado izquierdo de la tráquea. Cruzaba la tráquea y se dividía en las arterias carótida común y subclavia derecha. La arteria vertebral izquierda se originó a partir del arco aórtico entre los orígenes de la arteria carótida común izquierda y la arteria subclavia izquierda, luego la arteria vertebral izquierda ascendió hacia el foramen transversal de la séptima vértebra cervical. Se describe un caso de tronco braquiocefálico aberrante y la correspondiente arteria vertebral izquierda y se discuten las implicaciones clínicas de tal variante.

Topography of the middle genicular artery is associated with the superior and inferior genicular arteries / La topografía de la arteria genicular media está asociada con las arterias geniculares superiores e inferiores

Total knee arthroplasty has increased substantially, however anatomical studies of the genicular arteries (GAs) in this region are rare. The aim of this study was to identify the pattern and branching points of GAs and their relationship. In 42 lower limbs, the pattern and branching points of GAs were confirmed. The horizontal line which extends between the most prominent point of the lateral and medial margins of patella was defined as a reference line. The distance of branching point of the GAs from the reference line was measured, and the correlations between these points were analyzed. The superior lateral and medial genicular arteries (SLGA and SMGA) were located at + 38.17 ± 3.10 mm and + 32.68 ± 3.83 mm from the reference line, respectively. The middle genicular artery (MGA) was originated from + 7.57 ± 3.98 mm. The inferior lateral and medial genicular arteries (ILGA and IMGA) were located at - 18.46 ± 2.63 mm and - 24.09 ± 3.52 mm, respectively. The branching points of the SLGA changed significantly according to the arterial branching pattern with the MGA. In addition, the branching point of the MGA had positive relationships with that of the IMGA (r = 0.385, p <0.05) and that of the ILGA (r = 0.348, p <0.05), respectively. In this study, topography of the GAs and its anatomical association were demonstrated for the first time in Korean cadavers. Knowledge of the topography about frequent variation would be useful for safe surgery and clinical procedures.

La artroplastía total de rodilla ha aumentado sustancialmente, sin embargo los estudios anatómicos de las arterias geniculares (AGs) en esta región son escasos. El objetivo de este estudio fue identificar los patrones y puntos de ramificación de las AGs y sus relaciones. En 42 miembros inferiores, se identificaron el patrón y los puntos de ramificación de las AGs. La línea horizontal que se extiende entre el punto más prominente de los márgenes lateral y medial de la patela se definió como una línea de referencia. Se midió la distancia entre el punto de ramificación de las AGs y la línea de referencia, y se analizaron las correlaciones entre estos puntos. Las arterias geniculares superiores lateral y medial (AGSL y AGSM, respectivamente) se situaron a + 38,17 ± 3,10 mm y + 32,68 ± 3,83 mm de la línea de referencia, respectivamente, y la arteria genicular media (AGM) se originó a partir de + 7,57 ± 3,98 mm. Las arterias geniculares inferiores lateral y medial (AGIL e AGIM, respectivamente) se localizaron a - 18,46 ± 2,63 mm y - 24,09 ± 3,52 mm, respectivamente. Los puntos de ramificación de la AGSL cambiaron significativamente de acuerdo con el patrón de ramificación arterial con respecto a la AGSM. Además, el punto de ramificación de la AGSM tuvo relaciones positivas con el de la AGIM (r = 0.385, p <0.05) y el de la AGIL (r = 0.348, p <0.05). En este estudio, la topografía de las AGs y su asociación anatómica se demostraron por primera vez en cadáveres coreanos. El conocimiento de la topografía sobre la variación frecuente sería útil para su aplicación en el desarrollo de cirugías y procedimientos clínicos seguros.