Main Model
30 Tendon of extensor digitorium muscle of hand
Extensor digitorum
Proximal Attachment: Lateral epicondyle of humerus (common extensor origin)
Distal Attachment: Extensor expansions of medial four digits
Innervation: Deep branch of radial nerve (C7, C8)
Main Action(s): Extends medial four digits primarily at metacarpophalangeal joints, secondarily at interphalangeal joints