The starting point and ending point of extensor carpi ulnaris

1. Starting point: The starting point of extensor carpi ulnaris is located below the medial epicondyle of humerus, and it starts from the deep surface of flexor carpi ulnaris and flexor digitorum superficialis.

2. Stop point: the stop point of extensor carpi ulnaris, where the tendon passes through the wrist joint and is divided into two terminal tendons, which stop at the distal thumb and the proximal index finger respectively.