Palmaris brevis muscle
Palmaris brevis muscle | |
---|---|
Details | |
Origin | Flexor retinaculum (medial) and palmar aponeurosis |
Insertion | Palm |
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 |
Identifiers | |
Latin | Musculus palmaris brevis |
TA98 | A04.6.02.053 |
TA2 | 2520 |
FMA | 37381 |
Anatomical terms of muscle |
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] The palmaris brevis may protect the ulnar nerve and ulnar artery from compressive forces during repetitive grasping actions.[4] The muscle has a fatigue resistant fiber type profile, which supports the idea of a protective function to the ulnar neurovasculature during repetitive intermittent grasping tasks.[5]
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.
See also
Additional images
References
This article incorporates text in the public domain from page 463 of the 20th edition of Gray's Anatomy (1918)
- ^ a b Gray's Anatomy (1918, see infobox)
- ^ a b "Palmaris brevis". PT Central. 1998. Archived from the original on 2012-02-04. Retrieved February 2012.
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(help) - ^ a b "Palmaris brevis muscle". Retrieved February 2012.
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(help) - ^ Moore, Colin W.; Rice, Charles L. (December 2017). "Structural and functional anatomy of the palmaris brevis: grasping for answers". Journal of Anatomy. 231 (6): 939–946. doi:10.1111/joa.12675.
- ^ Moore, Colin W.; Beveridge, Tyler S.; Rice, Charles L. (October 2017). "Fiber type composition of the palmaris brevis muscle: implications for palmar function". Journal of Anatomy. 231 (4): 626–633. doi:10.1111/joa.12652.