Ray Bappaditya, Rai Anju Lata, Roy T S
Department of Anatomy, All India Institute of Medical Sciences, New Delhi 110 029, India.
Clin Anat. 2004 Nov;17(8):672-6. doi: 10.1002/ca.20024.
Anatomical variations of the coracobrachialis muscle (CBM) are common. We detected an abnormal form of the CBM of the left arm during human cadaver dissection. The CBM originated from the tip of the coracoid process of the scapula and divided into muscular and musculo-aponeurotic bellies. The muscular belly inserted into the middle of the anteromedial surface of the humerus, which is the normal anatomic insertion point of the CBM. The musculo-aponeurotic belly inserted into the medial intermuscular septum as well as the brachial fascia, creating a tunnel for the passage of the brachial artery. Inside the tunnel, the brachial artery bifurcated into the radial and ulnar arteries. No abnormality of the CBM, the brachial artery, or the median nerve was detected in the contralateral arm. The phylogenic, ontogenic, functional, and clinical importance of this variant muscle is described. Knowledge of such variations is of considerable importance during invasive and non-invasive investigative procedures or orthopedic, reconstructive, or surgical procedures.
肱二头肌（CBM）的解剖变异很常见。我们在人体尸体解剖过程中发现了左臂CBM的一种异常形态。CBM起于肩胛骨喙突尖，分为肌腹和肌-腱膜腹。肌腹插入肱骨前内侧表面中部，这是CBM正常的解剖插入点。肌-腱膜腹插入肌间隔内侧以及肱筋膜，为肱动脉形成一条通道。在通道内，肱动脉分为桡动脉和尺动脉。对侧手臂未检测到CBM、肱动脉或正中神经异常。描述了这种变异肌肉的系统发生、个体发生、功能和临床重要性。了解这些变异在侵入性和非侵入性检查程序或骨科、重建或外科手术过程中具有相当重要的意义。
