Palmaris brevis 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.

Palmaris brevis muscle
The muscles of the left hand. Palmar surface (palmaris brevis visible at center left).
Details
OriginFlexor retinaculum (medial) and palmar aponeurosis
InsertionPalm
ArteryPalmar metacarpal artery
NerveSuperficial branch of ulnar nerve
ActionsPulls on skin over hypothenar eminence, deepening the cup of the palm and so improving grip
Identifiers
LatinMusculus palmaris brevis
TAA04.6.02.053
FMA37381
Anatomical terms of muscle

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
  • The palmar aponeurosis

References

This article incorporates text in the public domain from page 463 of the 20th edition of Gray's Anatomy (1918)

  1. Gray's Anatomy (1918, see infobox)
  2. "Palmaris brevis". PT Central. 1998. Archived from the original on 2012-02-04. Retrieved February 2012. Check date values in: |accessdate= (help)
  3. "Palmaris brevis muscle". Retrieved February 2012. Check date values in: |accessdate= (help)
  4. 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.
  5. 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.
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