Name Extensor carpi ulnarisPronunciation (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) | 
