PS 1001:03 Lecture Notes - Lecture 18: Trochlear Notch, Hinge Joint, Ulna
Understand and describe the function and structure of the elbow complex in terms
of movement and stability
Screen clipping taken: 26/04/2018 10:02 PM
e.g. flexion = drinking, extension = putting on shoes, pronation/supination in forearm (radius rotates distally
around ulna)
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Elbow can shorten/lengthen upper limb
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Function
Synovial hinge joint
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Trochlea articulates with ulnas trochlear notch
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Head of radius articulates with capitulum
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Radial and coronoid fossa
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Structure
L2 - The elbow complex
Thursday, 26 April 2018
10:00 PM
wk 9 Page 1
Screen clipping taken: 26/04/2018 10:03 PM
Distal end of humerus and proximal end of ulna
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Screen clipping taken: 26/04/2018 10:20 PM
wk 9 Page 2
Screen clipping taken: 26/04/2018 10:21 PM
Proximal end of radius
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Screen clipping taken: 26/04/2018 10:23 PM
Trochea and trochea notch of ulna
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Capitulum and head of radius
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Humerus with radius and ulna
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Articulations
wk 9 Page 3
Document Summary
Understand and describe the function and structure of the elbow complex in terms of movement and stability. Elbow can shorten/lengthen upper limb e. g. flexion = drinking, extension = putting on shoes, pronation/supination in forearm (radius rotates distally around ulna) Radial and coronoid fossa wk 9 page 1. Distal end of humerus and proximal end of ulna. Screen clipping taken: 26/04/2018 10:20 pm wk 9 page 2. Capitulum and head of radius wk 9 page 3. At distal radio ulna joint (distal end of radius and head of ulna) Due to bone surfaces, trochlear ridge fits snugly with trochlear groove, helped by ligaments and muscles. Greatest stability in 90 degs flexion, in mid pronation/supination (writing position) Head of radius not in contact with capitulum for some of the time ie. in extension. Superior radioulna joint - small articular contact, so more mobile allowing increased hand movement. Wrist and finger extensors attach to lateral epicondyle of humerus.
