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22 Cards in this Set
- Front
- Back
What is the joint of the elbow?
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Humeroulnar
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What bony portions of the ulna in involved in humeroulnar joint?
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olecranon-more proximal and posterior portion fits into the olecranon fossa of humerus
coronoid process-distal to the olecranon forms distal border of the trochlear notch of the ulna Trochlea of the humerus-articulates on the trochlear notch of the ulna |
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What type of joint is the humeroulnar joint? (structure and movement)
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synovial uniaxial
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What type of joint is the Proximal radioulnar joint?
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synovial uniaxial
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What type of joint is the humoradial joint?
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synovial
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What movements occur within the proximal radioulnar joint?
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Pronation and supination
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What are the bony articulations of the proximal RU joint?
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Head of radius and radial notch of ulna
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What are the bony articulations of the humeroradial joint?
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concavity of the radial head and the Capitulum of the humerus
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What does the annular ligament surround?
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The radial head, it hold the radial head to the ulna
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What does the radial collateral ligament attach?
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Epicondyle of the humerus to the anular ligament of the radius
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What movements does the radial collateral ligament prevent?
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Adduction and hyperextension (along with the ulnar collateral)
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Describe the ulnar collateral ligament?
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It attaches in a triangular fashion the medial epicondyle, the olecranon, and the coronoid process.
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What portions of the elbow capsule are particularly weak?
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Anterior and posterior portions
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What is often fractured in a dislocated elbow?
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Coronoid
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What type of joint is the middle radioulnar joint?
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syndemosis
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What forms the middle radioulnar joint?
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Interosseous membrane
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In what direction do the fibers of the interosseous membrane run?
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obliquely upward from ulna to radius
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What bone bears most of the weight at the wrist (radius or ulna)?
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Radius
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Which bone (radius or ulna) bears most of the weight of a fall in the elbow?
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Ulna
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What bony articulations are involved in the distal radioulnar joint?
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Distal end of the ulna and the ulnar notch of the radius
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What type of joint is the distal RU joint?
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Synovial
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Going fron proximal to distal how does the type of joint change in the radioulnar joints?
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Proximal radioulnar is synovial
Middle is syndesmosis Distal is synovial |