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Palmaris brevis muscle

Muscle of the hand

Muscle of the hand

FieldValue
NamePalmaris brevis muscle
Latinmusculus palmaris brevis
ImageMusculuspalmarisbrevis.png
CaptionThe muscles of the left hand. Palmar surface (palmaris brevis visible at center left).
OriginFlexor retinaculum (medial) and palmar aponeurosis
InsertionPalm
ActionPulls on skin over hypothenar eminence, deepening the cup of the palm and so improving grip
BloodPalmar metacarpal artery
NerveSuperficial branch of ulnar nerve

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. 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, and occasionally on the pisiform bone.

Innervation

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

Blood supply

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

Discovery

The first recorded observation of the muscle is by Italian anatomist Giambattista Canano sometime before 1543. The muscle was independently discovered a few years later by Realdo Colombo before being pushed to general acceptance in the works of Andreas Vesalius.

Function

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

Additional images

References

References

  1. (2008). "Gray's anatomy : the anatomical basis of clinical practice". Churchill Livingstone/Elsevier.
  2. (2017-01-01). "Chapter 53 - Nerve Entrapments of the Wrist and Hand". Elsevier.
  3. (1998). "Palmaris brevis". PT Central.
  4. (2019). "History of Anatomy: An International Perspective". Wiley.
  5. "palmaris brevis muscle (anatomy) - General Practice Notebook".
  6. (December 2017). "Structural and functional anatomy of the palmaris brevis: grasping for answers". Journal of Anatomy.
  7. (October 2017). "Fiber type composition of the palmaris brevis muscle: implications for palmar function". Journal of Anatomy.
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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