Das S, Maatoq Sulaiman I, Hussan F, Haji Suhaimi F, Latiff A A, Othman F
Department of Anatomy, Faculty of Medicine, University Kebangsaan Malaysia, Jalan Raja Muda Abd Aziz, 50300 Kuala Lumpur, Malaysia.
Clin Ter. 2009;160(1):25-7.
The flexor compartment muscles of the arm comprising of biceps brachii, brachialis and the coracobrachialis are innervated by the musculocutaneous nerve arising from the lateral cord of the brachial plexus. In the present study, we report a case of anomalous innervation of the corachobrachialis muscle on the left side of a 45-year-old male cadaver. The musculocutaneous nerve originated from the lateral cord, as usual and pierced the corachobrachialis muscle. The median nerve was formed by a contribution from both lateral and medial roots, both of which took origin from the lateral and medial cords, respectively. In addition to the usual musculocutaneous nerve which pierced the corachobrachialis muscle and innervated it, two more anomalous branches from the median nerve were observed to innervate the corachobrachialis. The anatomical knowledge of the variations of the innervations of the corachobrachialis muscle may be important not only for surgeons performing coracoid transfer but also for clinicians diagnosing nerve lesions.
臂部的屈肌肌群由肱二头肌、肱肌和喙肱肌组成，由臂丛神经外侧束发出的肌皮神经支配。在本研究中，我们报告了一例45岁男性尸体左侧喙肱肌异常支配的病例。肌皮神经像往常一样起源于外侧束，并穿过喙肱肌。正中神经由外侧根和内侧根共同组成，这两个根分别起源于外侧束和内侧束。除了穿过喙肱肌并支配它的正常肌皮神经外，还观察到正中神经有另外两个异常分支支配喙肱肌。喙肱肌神经支配变异的解剖学知识不仅对外科医生进行喙突转移手术很重要，对临床医生诊断神经损伤也很重要。
