flexor pollicis brevis muscle

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Also found in: Acronyms.

flex·or pol·li·cis bre·vis mus·cle

(fleks'ŏr pol'li-sis brē'vis mŭs'ĕl)
Origin, superficial portion from flexor retinaculum of wrist, deep portion from ulnar side of first metacarpal bone; insertion, base of proximal phalanx of thumb; action, flexes proximal phalanx of thumb; nerve supply, median (superficial head) and deep branch of ulnar (deep head). Some authors consider the deep head to be the first in a series of four palmar interossei muscles of the hand.
Synonym(s): short flexor muscle of thumb.

flexor pollicis brevis muscle

A muscle of the hand originating on the flexor retinaculum and trapezium, trapezoid, and capitate and inserted on the lateral side of the base of the first phalanx of the thumb. It flexes the thumb at both the carpometacarpal joint and the metacarpophalangeal joint and is controlled by the median and the ulnar nerves.
See also: muscle
References in periodicals archive ?
For the flexor pollicis brevis, the interaction effect of diameter and weight (p=.53, ?2=.02), and the main effects of diameter (p=.36, [[eta].sup.2]=.05) and weight (p=.17, [[eta].sup.2]=.10) were not statistically significant.
Thirty-two percent of the subjects accurately identified which mirror was most comfortable within the flexor pollicis brevis. Eighteen percent of the subjects accurately identified which mirror was least comfortable within the extensor digitorum.
In the flexor pollicis brevis, results illustrate the main effect of padding had a statistically significant effect (p=.01, [[eta].sup.2]=.30) on muscle activity while grasping mirror handles.
Twenty-one percent of the subjects accurately identified which mirror was most comfortable within the extensor digitorum and the flexor pollicis brevis. Thirty-two percent of the subjects accurately identified which mirror was most comfortable within the flexor digitorum superficialis.
The largest statistically significant reduction of muscle activity occurred during phase II of this study, in one of the largest muscles of the thumb, the flexor pollicis brevis. Padding reduced mean muscle activity by 3.7 [micro]v.
Loss of opposition is a very significant functional impairment, although in pure median nerve palsy opposition is often adequately preserved, especially when the flexor pollicis brevis is entirely innervated by the ulnar nerve.

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