A branch of the musculocutaneous nerve supplying the short head of biceps, typically arising as the musculocutaneous nerve penetrates the coracobrachialis. The short head receives its own branch distinct from the long head branch, reflecting the two-part origin of the biceps.
The nerve to the short head of biceps is the second branch of the musculocutaneous nerve after the nerve to coracobrachialis. Selective denervation of the short head produces slight weakening of forearm supination and elbow flexion, detectable by EMG needle examination comparing short head and long head activation. This distinction is relevant in localising brachial plexus injuries and in targeted selective neurectomy for spastic elbow flexion.
Loss of short head biceps function from selective musculocutaneous branch injury producing subtle elbow flexion weakness, confirming nerve injury distal to the coracobrachialis branch but at or proximal to the short head branch origin.
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