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Skeleton of Arm
8.1--Upper Limb: Humerus, Radius, Ulna
| Term | Definition |
|---|---|
| Humerus | Longest bone in upper limb |
| Greater Tubercle | Rounded top (head) |
| Lesser Tubercle | 2nd rounded top, more anterior and medial, but inferior (head) |
| Intertubercular sulcus | Groove in between greater and lesser tubercle |
| Surgical Neck | Constriction in humerus; distal to tubercles |
| Body (shaft) | Becomes triangular at distal end |
| Deltoid Tuberosity | Point of attachment for tendon of deltoid muscle |
| Radial Groove | runs along posterior margin of deltoid tuberosity on posterior surface of humerus |
| Capitulum | Rounded knob; articulates with Radius |
| Radial Fossa | Anterior depression above capitulum that articulates with radius when flexed |
| Trochlea | Medial to capitulum; articulates with ulna |
| Coronoid Fossa | receives coronoid process from ulna |
| Olecranon Fossa | Posterior depression; receives olecranon from ulna when extended |
| Medial epicondyle; Lateral Epicondyle | More projected; more flattened |
| Ulna | Medial aspect (finger side) of forearm and longer than radius; thicker at proximal end |
| Olecranon | Posterior projection; articulates with olecranon fossa |
| Trochlear Noth | articulates with trochlea of humerus (anterior |
| Coronoid Process | Articulates with coronoid foss (anterior) |
| Head (Ulna) | Distal side |
| Syloid Process | Projection on posterior side at distal end |
| Radius | Shorter of two; thicker at distal, anterior side |
| Head (Radius) | Proximal side; articulates with capitulum |