The ulnar head arises from the coronoid and forms the deep boundary of the inter-head interval through which the median nerve passes. It is smaller than the humeral head.
| Origin | Coronoid process of the ulna — medial aspect |
|---|---|
| Insertion | Lateral radius — merges with the humeral head at the pronator tubercle |
| Nerve Supply | Median nerve (C6, C7) |
| Blood Supply | Ulnar artery |
| Actions | Contributes to forearm pronation; The ulnar head is the medial limb of the nerve passage interval |
|---|
The ulnar head is the deep wall of the pronator teres tunnel. In pronator syndrome surgery, the fibrous arch at the deep surface of the ulnar head is released. Forearm fractures near the coronoid may avulse the ulnar head and alter the pronation force.
Not separately palpable from the humeral head.
Fibrous arch at the deep surface of the ulnar head forming one of the potential compression sites for the median nerve in the pronator tunnel.
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