The humero-ulnar head arises from the medial epicondyle and coronoid and is the dominant head in mass flexion, supplying ring and little finger slips.
| Origin | Medial epicondyle (common flexor origin) and ulnar coronoid process |
|---|---|
| Insertion | Middle phalanges of ring and little fingers predominantly |
| Nerve Supply | Median nerve (C7, C8, T1) |
| Blood Supply | Ulnar artery |
| Actions | Flexes the PIP joints of ring and little fingers; Assists wrist flexion |
|---|
The humeral head FDS origin at the common flexor tendon is involved in medial epicondylitis. In elbow UCL reconstruction, the common flexor origin is split to access the medial joint.
Tenderness at the medial epicondyle during resisted wrist flexion.
Microtearing of the FDS humeral head origin producing golfer's elbow pain, managed by eccentric loading and medial epicondyle injection.
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