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) | 
