Palmaris brevis muscle
| Palmaris brevis muscle | |
|---|---|
 |
|
| The muscles of the left hand. Palmar surface (palmaris brevis visible at center left). | |
| Latin | Musculus palmaris brevis |
| Gray's | subject #126 463 |
| Origin | Flexor retinaculum (medial) and palmar aponeurosis |
| Insertion | Palm |
| Artery | |
| Nerve | Superficial branch of ulnar nerve |
| Actions | Pulls on skin over hypothenar eminence, deepening the cup of the palm and so improving grip |
Palmaris brevis is a thin, quadrilateral muscle, placed beneath the integument of the ulnar side of the hand.[1] It acts to fold the skin of the hypothenar eminence transversally.
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,[1] and occasionally on the pisiform.[2]
Action
It tenses the skin of the palm on the ulnar side during a grip action,[2] and deepens the hollow of the palm.[3]
Innervation
It is the only muscle innervated by the superficial branch of the ulnar nerve (C8, T1).[3]
Blood supply
It is supplied by the palmar metacarpal artery of the deep palmar arch.[2]
References
- ^ a b Gray's Anatomy (1918, see infobox)
- ^ a b c "Palmaris brevis". PT Central. 1998. Retrieved February 2012.
- ^ a b "Palmaris brevis muscle". Retrieved February 2012.
This article incorporates text from a public domain edition of Gray's Anatomy.
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