What is the action of the Dorsal interosseous muscle?
They abuduct the fingers. The Adduct the 3 middle digits. The pollicis has it's own abductors. The abductor poolicis longus that runs on the dorsal for arm, and the abductor pollicics breveis which is the most superficial thenar muscle (others are the flexor policis brevis, and the opponens pollicis). The medial digit (digiti minimi) also has it's own abductor (the abbuctor digiti minimi) It has has the flexor digiti minimi brevis and the opponens digiti minimi