Palmaris brevis muscle

Palmaris brevis muscle
	The muscles of the left hand. Palmar surface (palmaris brevis visible at center left).
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 muscle 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.

Structure

Origin and insertion

Palmaris brevis muscle is located on the ulnar side of the hand.[1][2] It arises from the tendinous fasciculi from the transverse carpal ligament and palmar aponeurosis. The muscle fibres are inserted into the skin on the ulnar border of the palm of the hand,[1] and occasionally on the pisiform bone.[3]

Innervation

Palmaris brevis muscle is the only muscle innervated by the superficial branch of the ulnar nerve (C8, T1).[2]

Blood supply

Palmaris brevis muscle is supplied by the palmar metacarpal artery of the deep palmar arch.

Function

Palmaris brevis muscle tenses the skin of the palm on the ulnar side during a grip action.[2][3] It also deepens the hollow of the palm.[4] The palmaris brevis may protect the ulnar nerve and ulnar artery from compressive forces during repetitive grasping actions.[5] 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.[6]

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)

Gray's anatomy : the anatomical basis of clinical practice. Standring, Susan., Gray, Henry, 1825-1861. (40th ed., anniversary ed.). [Edinburgh]: Churchill Livingstone/Elsevier. 2008. ISBN 978-0-443-06684-9. OCLC 213447727.CS1 maint: others (link)
Palazzo, J. J.; Galloway, K. (2017-01-01), Placzek, Jeffrey D.; Boyce, David A. (eds.), "Chapter 53 - Nerve Entrapments of the Wrist and Hand", Orthopaedic Physical Therapy Secrets (Third Edition), Elsevier, pp. 429–436, ISBN 978-0-323-28683-1, retrieved 2021-01-07
"Palmaris brevis". PT Central. 1998. Archived from the original on 10 March 2018. Retrieved 25 February 2012.
"palmaris brevis muscle (anatomy) - General Practice Notebook". gpnotebook.com. Retrieved 2021-01-07.
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. PMC 5696130. PMID 28786108.
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. PMC 5603781. PMID 28620932.

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[:0-1] Gray's anatomy : the anatomical basis of clinical practice. Standring, Susan., Gray, Henry, 1825-1861. (40th ed., anniversary ed.). [Edinburgh]: Churchill Livingstone/Elsevier. 2008. ISBN 978-0-443-06684-9. OCLC 213447727.CS1 maint: others (link)

[:1-2] Palazzo, J. J.; Galloway, K. (2017-01-01), Placzek, Jeffrey D.; Boyce, David A. (eds.), "Chapter 53 - Nerve Entrapments of the Wrist and Hand", Orthopaedic Physical Therapy Secrets (Third Edition), Elsevier, pp. 429–436, ISBN 978-0-323-28683-1, retrieved 2021-01-07

[PTC-3] "Palmaris brevis". PT Central. 1998. Archived from the original on 10 March 2018. Retrieved 25 February 2012.

[4] "palmaris brevis muscle (anatomy) - General Practice Notebook". gpnotebook.com. Retrieved 2021-01-07.

[5] 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. PMC 5696130. PMID 28786108.

[6] 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. PMC 5603781. PMID 28620932.