Fig. 3. The different innervation patterns of the CBM. (A) In pattern (I): The muscular branch of CBM (arrow) originates from the MCN before its piercing. (B) In pattern (II): CBM innervates from a muscular branch (arrow) originating from the LC. (C) IN pattern (III): CBM innervates from a muscular branch (arrow) originating from the LR of MN. (D) In pattern (IV): CBM innervates from a muscular branch (arrow) originating from the MN itself. CBM, coracobrachialis muscle; MCN, musculocutaneous nerve; SH, short head of biceps; LH, long head of biceps; AX, axillary artery; BA, brachial artery; UN, ulnar nerve; MCF, medial cutaneous of forearm; Cb, communicating branch; CP, coracoid process; 3rd, third head of biceps; LC, lateral cord; LR, lateral root; MN, median nerve; MC, medial cord; Lat. Dorsi, latissimus dorsi muscle. *****Abnormal insertion of brachialis.
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