Opponens digiti minimi muscle of hand
|Opponens digiti minimi muscle|
Deep muscles of the right hand, palmar view.
|Origin||Hook of hamate and flexor retinaculum|
|Insertion||Medial border of 5th metacarpal (in hand, 3rd digit is orientation of mid-line)|
|Nerve||deep branch of ulnar nerve (C8 and T1)|
|Actions||Draws 5th metacarpal anteriorly and rotates it, bringing little finger (5th digit) into opposition with thumb|
|Latin||musculus opponens digiti minimi
(Old: Opponens quinti digiti)
|Anatomical terms of muscle|
The opponens digiti minimi (opponens digiti quinti in older texts) is a muscle in the hand. It is of a triangular form, and placed immediately beneath the palmaris brevis, abductor digiti minimi and flexor digiti minimi brevis. It is one of the three hypothenar muscles that control the little finger.
It arises from the convexity of the hamulus of the hamate bone and the contiguous portion of the transverse carpal ligament; it is inserted into the whole length of the metacarpal bone of the little finger, along its ulnar margin.
The opponens digiti minimi muscle serves to flex and laterally rotate the 5th metacarpal about the 5th carpometacarpal joint, as when bringing the little finger and thumb into opposition. It is innervated by the deep branch of the ulnar nerve.
The muscles of the thumb. (Opponens quinti digiti visible at center right.)
Front of the left forearm. Deep muscles. (Opponens digiti quinti visible at bottom left.)
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