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BMS 301 (47)
Lecture

Elbow region, true elbow joint, radioulnar joints, muscles of the arm

3 Pages
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Department
Biomedical Science
Course Code
BMS 301
Professor
Mark Frasier

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28 November
Elbow region
Composite joint – 3 articulations
Common joint capsule
Make up “true” elbow joint
Trochlea of humerus and trochlear notch of ulna
Capitulum of humerus and head of radius
Head of radius and radial notch of ulna
True elbow joint
Humerus with radius and ulna
Synovial, uniaxial, hinge
Allows flexion and extension
Strong collateral ligaments prevent abduction or adduction
Ulnar on medial side
Radial on lateral side
“Carrying” angle – in anatomical position, forearms point outward
“Tennis elbow” – lateral epicondylitis
Inflammation of tendons at lateral epicondyle of humerus
Ulnar nerve passes posterior to medial epicondyle of humerus
Hitting – funny bone
Supinate – palm up
Pronate – palm down, bones crossed

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Description
28 November Elbow region Composite joint – 3 articulations Common joint capsule Make up “true” elbow joint Trochlea of humerus and trochlear notch of ulna Capitulum of humerus and head of radius Head of radius and radial notch of ulna True elbow joint Humerus with radius and ulna Synovial, uniaxial, hinge Allows flexion and extension Strong collateral ligaments prevent abduction or adduction Ulnar on medial side Radial on lateral side “Carrying” angle – in anatomical position, forearms point outward “Tennis elbow” – lateral epicondylitis Inflammation of tendons at lateral epicondyle of humerus Ulnar nerve passes posterior to medial epicondyle of humerus Hitting – funny bone Supinate – palm up Pronate – palm down, bones crossed Radioulnar joints Proximal and distal Both synovial, uniaxial, rotational or pivotal Radius is spinning, ulna stays still Radius is attached to carpal bones, they move with it Movement is pronation and supination Radius and ulna held together by Interosseus membrane (ligament) Energy moves up radius from hand, tightens Interosseus membrane, energy transfer to ulna, on to humerus Annular ligament Runs around head of radius without attaching to it
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