ENS 303 Lecture Notes - Lecture 21: Suprascapular Notch, Suprasternal Notch, Deltoid Tuberosity
9 May 2017
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Document Summary
Lots of mobility, not as much stability; shallow concave socket. Allows functional placement of hand in 16,000 diff positions. Acts in concert with elbow to lift, push/ pull body/ objects. Bear weight on hands w push ups, crutch/cane use most shoulder exercises are open chain but there are some, pushing door open, machines. Jugular notch - first rib - level w jugular notch. Body of sternum - ribs connect here. Ball and socket - 3 degrees of motion. Transverse humeral lig - over biceps tendon - torn thl leads to biceps tendon subluxation. Gh ligs (above as well) (all static stabilizers): Glenoid labrum - deepens the socket , fibrous ct, biceps long head attaches superiorly. Horizontal flexion (adduction) , horizontal extension (abduction) - transverse plane. Internal rotation , external rotation - transverse plane. Rolls superiorly and slides inferiorly in order to stay in socket and prevent impingement of bursa. Dynamic involvement from supraspinatus to depress humeral head.
