Question: what is the origin and insertion of extensor carpi ulnaris?
Answer: Origin and insertion The extensor carpi ulnaris muscle originates from the lateral epicondyle of humerus, via the common extensor tendon, and adjacent fascia. ... Shortly after entering the hand, the tendon passes over the dorsal surface of triquetral bone and inserts to the medial aspect of the base of metacarpal bone 5.