Name

# Adductor Pollicis

Pronunciation

(ad-DUK-tor POL-uh-sus)

Origin/Proximal Attachment

Transverse Head: 3rd metacarpal Oblique Head: base of 1st-3rd metacarpals; floor of carpal tunnel

Insertion/Distal Attachment

Medial aspect of base of proximal phalanx; medial sesamoid at MCP

Action/Relevance

Adducts thumbMay assist to flex thumb (at MCP joint)

Innervation

Ulnar nerve - deep branch (C8, T1)

Notes

Muscle for adduction and opposition of the thumb. Origin: oblique head: the capitate and the bases of the second and third metacarpals. Transverse head: palmar aspect of third metacarpal. Insertion: ulnar side of the base of the proximal phalanx of the thumb.