Name
Pronunciation
(eks-TEN-sor KAR-pi ul-NAR-is)
Origin/Proximal Attachment
Lateral epicondyle via the common extensor tendon, posterior body of ulna & antebrachial fascia
Insertion/Distal Attachment
Base of 5th metacarpal (medial side)
Action/Relevance
Extends the hand at the wristUlnar deviation of the hand at the wrist
Innervation
Radial nerve - posterior interosseous (C6, 7,8)
Notes
Extensor carpi ulnaris is a muscle, located in the forearm of human bodies that acts to extend and adduct the wrist.
Being an extensor muscle, extensor carpi ulnaris is on the posterior side of the forearm. It attaches to the lateral epicondyle of the humerus, though it crosses the forearm to the ulnar (medial) side, and attaches to the base of the 5th metacarpal.
It is innervated by a branch of the radial nerve, namely the posterior interosseus nerve. Its arterial supply comes from the ulnar artery.