Overview
It has two heads, humeral and ulnar, that join in a common tendon. It forms the caudomedial border of the forearm and ends on the accessory carpal bone.
Origin
- Humeral head (caput humerale): medial epicondyle of the humerus.
- Ulnar head (caput ulnare): medial surface of the olecranon.
Insertion
Accessory carpal bone (os carpi accessorium).
Action
Flexes the carpus.
Innervation
Ulnar nerve (n. ulnaris).