Name
Pronunciation
(o-PONE-ens POL-uh-sus)
Origin/Proximal Attachment
Distal border of flexor retinaculum; trapezium
Insertion/Distal Attachment
Lateral aspect of 1st metacarpal
Action/Relevance
Opposes thumb to the fingers
Innervation
Median nerve - recurrent branch (C8, T1)
Notes
The Opponens pollicis is a small, triangular muscle, placed beneath the preceding. It arises from the ridge on the greater multangular and from the transverse carpal ligament, passes downward and lateralward, and is inserted into the whole length of the metacarpal bone of the thumb on its radial side.