Name

# Abductor Digiti Minimi (hand)

Pronunciation

(ab-DUK-tor DIJ-I-ti MIN-I-mi)

Origin/Proximal Attachment

Pisiform & tendon of flexor carpi ulnaris

Insertion/Distal Attachment

Medial aspect of base of proximal phalanx of 5th digit

May send slip to ulnar side of dorsal expansion

Action/Relevance

Abducts 5th digit (requires pisiform stabilized by FCU)

Assists to flex 5th digit (at MCP)

May assist in extension of 5th digit (at IP due to slips to extensor digitorum)

Innervation

Ulnar nerve - deep branch (C8, T1)

Notes

Muscle for abduction of the fifth finger. Origin: pisiform and tendon of flexor carpi ulnaris tendon. Insertion: ulnar aspect of the base of the proximal phalanx of the fifth finger.