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Home | OG anatomy | Gross Anatomy | Topic index | Chapter 15
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| Glenohumeral Joint | |
| Classification | |
| The shoulder joint is a synovial joint of the ball-and-socket (enarthroidal) type. Functionally multiaxial | |
| Articular surfaces | |
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| Glenoid Fossa | |
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 Concave vertically and A/P Articular surface represents just over 1/3 that of humeral head The Gleniod labrum, triangular in cross-section like the hip, surround and deepens the glenoid fossa |
| Head Of Humerus | |
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Forms 2/5 of a sphere Regardless of position only 1/3 of head is in contact with gleniod at any one time. |
| Joint surface markings | |
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The midpoint of the joint is approximately 1cm lateral to the apex of the coracoid process A vertical line slightly concave laterally through this point gives an indication of the joint line |
| Note : The joint is unstable: it is built for mobility, not stability, and dislocation is more common at this joint than at any other in the body. | |
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