Insertion Palm | ||
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Origin Flexor retinaculum (medial) and palmar aponeurosis Artery Palmar metacarpal artery Nerve Superficial branch of ulnar nerve Actions Pulls on skin over hypothenar eminence, deepening the cup of the palm and so improving grip Latin Musculus palmaris brevis | ||
Palmaris brevis is a thin, quadrilateral muscle, placed beneath the integument of the ulnar side of the hand. It acts to fold the skin of the hypothenar eminence transversally.
Contents
Origin and insertion
It arises by tendinous fasciculi from the transverse carpal ligament and palmar aponeurosis; the fleshy fibers are inserted into the skin on the ulnar border of the palm of the hand, and occasionally on the pisiform.
Action
It tenses the skin of the palm on the ulnar side during a grip action, and deepens the hollow of the palm.
Innervation
It is the only muscle innervated by the superficial branch of the ulnar nerve (C8, T1).
Blood supply
It is supplied by the palmar metacarpal artery of the deep palmar arch.
References
Palmaris brevis muscle Wikipedia(Text) CC BY-SA