Flexor pollicis brevis muscle: Difference between revisions

Flexor pollicis brevis muscle
Flexor pollicis brevis muscle
	The muscles of the left hand. Palmar surface. (Flexor pollicis brevis visible at center right, near thumb.)
Details
Nerve	median nerve
Identifiers
Latin	musculus flexor pollicis brevis
TA98	A04.6.02.055
TA2	2522
FMA	37378
	Anatomical terms of muscle [edit on Wikidata]

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Revision as of 18:10, 27 September 2006

The flexor pollicis brevis is a muscle in the hand that flexes the thumb. It is one of three thenar muscles. It has both a superficial part and a deep part.

The superficial part arises from the distal edge of the flexor retinaculum of the hand and the tubercle of the trapezium, a bone in the wrist. It passes along the radial side of the tendon of the flexor pollicis longus, and, becoming tendinous, is inserted into the radial side of the base of the proximal phalanx of the thumb; in its tendon of insertion there is a sesamoid bone.

The deeper (and medial) portion of the muscle is very small, and arises from the ulnar side of the first metacarpal bone between the oblique part of the adductor pollicis and the lateral head of the first dorsal interosseous muscle, and is inserted into the ulnar side of the base of the first phalanx with the adductor pollicis.

The deep (medial) part of the flexor brevis pollicis is sometimes described as the first palmar interosseous muscle. When this muscle is included, the total number of palmar interossei is four. Otherwise, there are only three palmar interossei.

Innervation

The flexor pollicis brevis is mostly innervated by the recurrent branch of the median nerve (C8, T1). The deep part is often innervated by the deep branch of the ulnar nerve.

Action

The flexor pollicis brevis flexes the thumb at the first metacarpophalangeal joint.

External links

Template:MuscleLoyola
. GPnotebook https://www.gpnotebook.co.uk/simplepage.cfm?ID=228196359. {{cite web}}: Missing or empty |title= (help)
PTCentral

This article incorporates text in the public domain from page 461 of the 20th edition of Gray's Anatomy (1918)

This muscle article is a stub. You can help Wikipedia by expanding it.

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 The '''flexor pollicis brevis''' is a muscle in the hand that flexes the thumb.  It is one of three [[thenar muscles]].  It has both a superficial part and a deep part.
-The superficial part arises from the distal edge of the [[flexor retinaculum of the hand]] and the tubercle of the [[trapezium]], a bone in the wrist.  It passes along the radial side of the tendon of the [[flexor pollicis longus]], and, becoming tendinous, is inserted into the radial side of the base of the proximal [[phalanx]] of the [[thumb]]; in its tendon of insertion there is a [[sesamoid]] bone.
+The superficial part arises from the distal edge of the [[flexor retinaculum of the hand]] and the tubercle of the [[trapezium]], a bone in the wrist.  It passes along the radial side of the tendon of the [[flexor pollicis longus]], and, becoming tendinous, is inserted into the radial side of the base of the proximal [[Phalanx bones|phalanx]] of the [[thumb]]; in its tendon of insertion there is a [[sesamoid]] bone.
 The deeper (and medial) portion of the muscle is very small, and arises from the ulnar side of the first metacarpal bone between the oblique part of the [[adductor pollicis]] and the lateral head of the first dorsal [[interosseous muscle]], and is inserted into the ulnar side of the base of the first phalanx with the [[adductor pollicis]].