SAR HS 369 Lecture Notes - Lecture 7: Cubital Fossa, Olecranon Fossa, Head Of Radius
2 Jul 2020
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Document Summary
The top of the ulna is much more enlarged and pronounced than the top of the radius. Radius: features: radial head, radial neck, radial tuberosity (biceps attachment, shaft of radius: body of the radius, styloid process, ulnar notch. There are three joints in the elbow region that share a joint capsule: humeroulnar joint, medially, simple hinge, flexion/extension, humeroradial joint, laterally, modified hinge, flexion/extension, supination/pronation of the forearm, proximal radioulnar, between the radius and ulna, pivot, supination/pronation. Olecranon process is in close approximation to the distal humerus in the olecranon fossa. As we come into flexion, the olecranon process pulls away from the olecranon fossa and instead, the radial head and the coronoid process of the ulna approach their respective fossae on the anterior surface of the distal humerus. Supination occurs as the radial head spins on the capitulum and the radius rotates around the fixed ulna. Supination and pronation are really just movements of one bone: the radius.
