opponens pollicis muscle

(redirected from Opponens pollicis)
Also found in: Acronyms.

op·po·nens pol·li·cis mus·cle

(op-ō'nenz pol'li-sis mŭs'ĕl)
Origin, ridge of trapezium and flexor retinaculum; insertion, anterior surface of the full length of the shaft of the first metacarpal bone; action, acts at carpometacarpal joint to "cup" palm, enabling one to oppose thumb to other fingers; nerve supply, median.
Synonym(s): musculus opponens pollicis [TA] .

opponens pollicis muscle

A muscle of the hand originating on the trapezium and flexor retinaculum and inserted in the first metacarpal. It flexes and adducts the thumb (brings it across the palm) and is controlled by the median nerve.
See also: muscle
References in periodicals archive ?
Thenar muscles include the abductor pollicis, abductor pollicis brevis (abducts the thumb), flexor pollicis brevis (flexes the thumb) and opponens pollicis (produces opposition of the thumb).
The median nerve also serves the abductor pollicis brevis, the opponens pollicis, and the superficial head of the flexor pollicis brevis; involves the muscles to the thumb (Li, Harkness, & Goitz, 2005); and is the most specific motor assessment for CTS.
Bilateral biceps, brachioradialis, and triceps muscle stretch reflexes were tested, as were bilateral muscle strength in the biceps, triceps, deltoids, and opponens pollicis. The Finkelstein maneuver was performed by stabilizing the forearm, and instructing the subjects to make a fist with the thumb tucked inside the other fingers.
There was 3+/5 motor strength of the bilateral APB and opponens pollicis, but otherwise there was normal (5/5) motor strength testing of bilateral shoulder, elbow, forearm, wrist, and hand motions, and there was no atrophy or clonus noted in BUE.
Thus, carpal tunnel syndrome (CTS) is the entrapment neuropathy of the median nerve that causes paresthesia, pain, numbness, and weakness of the flexor pollicis brevis, opponens pollicis, and abductor pollicis brevis in the innervation area of the median nerve because of its compression in the wrist (1).