Lecture 6 Comparative Anatomy of the Elbow and Forearm Functions Of

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Lecture 6 Comparative anatomy of the Elbow and Forearm Functions of the Elbow in humans The set if the elbow allows for the hand to be placed in a position that makes it ideal for manipulation • Mostly non-weight supporting, and very important in throwing Bones Distal humerus- articulating parts Capitulum - Articulates with radial head - Almost half a sphere Trochlea - Like a pulleu - Articulates with trochlea notch of the ulna Distal humerus – non articulating parts Medial epicondyle - Blunt medial projection - Anterior surface has attachment for fore arm flexors Lateral epicondyle - Lateral non-articulating part - Attachment for forearm extensors on lateral part Distal humerus – fossae Olecranon fossa On posterior surface contains the olecranon of the ulna Coronoid fossa Anterior surface contains ulna coronoid process Radial fossa Shallow fossa anteriorly, contains the radius in flexion. Radius Proximal end Lateral bone in the forearm - Proximal end includes a head, neck and radial tuberosity - Head discoid and like a shallow cup, articulates with the capitulum - Neck is a constriction blew the head Distal end - Interosseous border for attachment of interosseous membrane - Styloid process sharp projection on lateral side of distal radius - Dorsal tubercle a large tuberosity on the posterior surface of the distal end. Ulna Proximal end - Olecranon hook like projection which enters the humeral olecranon fossa - Trochlea notch for articulation with the trochlea od the humerous - Coronoid process projects anteriorly distal to the olecranon - Radial notch – small oval depression on lateral side of coronoid process Distal end - Shaft sharp lateral border attachement foe Interosseous membrane - Styloid process on the distal end - Radial articulation distal rounded articulation that conforms to the ulna notch of the radius. Joints Elbow joint • Humero-ulna, synovial, hinge • Humero-radial, synovial, sliding Radio-ulnar joints • Superior, synovial, pivot • Inferior, synovial, pivot Elbow joint Humero-ulnar joint – trochlear of humerus and trochlear notch of ulna Humero-radial joint – capitulum of humerus and head of radius Radio-ulnar joints Superior radio-ulnar - head of the radius and the radial notch of the ulna Inferior radio-ulnar – the ulna notch at lower end of radiud and facet on lateral side of ulna. .

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