Extensor Carpi Ulnaris Anatomy

Innervation: Radial-post. interosseous
Origin:Lat. epicondyle of humerus
Insertion:5th metacapal base
Action:Extend/adduct hand

Ulnar Head - Axial View

1. Extensor Retinaculum
2. ECU Subsheath
3. ECU tendon
4. Ulnar Styloid
5. Ulnar Head

See Also: