El-Naggar Mostafa M, Al-Saggaf Samar
Department of Anatomy, Faculty of Medicine and Allied Sciences, King Abdulaziz University, Gazan and Jeddah, Kingdom of Saudi Arabia.
Clin Anat. 2004 Mar;17(2):139-43. doi: 10.1002/ca.10213.
This case report documents a variation in the insertion of the coracobrachialis muscle of the right arm of an adult male cadaver of unknown age. In addition to the normal insertion of the coracobrachialis muscle into the middle of the medial border of the humerus, an additional slender tendon passed inferiorly, crossing anterior to the median nerve and brachial artery before attaching to the medial epicondyle of the humerus. Most of the proximal part of the tendon gave rise to an aponeurotic expansion that inserted into the distal medial border of the humerus. The tendinous insertion and aponeurotic expansion may represent a variant of the coracobrachialis longus (Wood's) muscle and the internal brachial ligament, respectively. The median nerve and brachial artery traversed a tunnel bounded by the additional tendon and aponeurotic expansion as well as the usual humeral insertion of the coracobrachialis muscle. The clinical implication of this variation is that it may be a cause of median nerve entrapment and brachial artery compression.
本病例报告记录了一名年龄不详的成年男性尸体右臂肱二头肌插入情况的变异。除了肱二头肌正常插入肱骨内侧缘中部外，还有一条额外的细长肌腱向下走行，在附着于肱骨内上髁之前，从正中神经和肱动脉前方穿过。肌腱近端的大部分形成了一个腱膜扩展，插入到肱骨远端内侧缘。腱性插入和腱膜扩展可能分别代表肱二头肌长头（伍德氏）肌和臂内侧韧带的变异。正中神经和肱动脉穿过一个由额外肌腱、腱膜扩展以及肱二头肌通常的肱骨附着点所界定的通道。这种变异的临床意义在于它可能是正中神经卡压和肱动脉受压的一个原因。
