Kinesiology 2241A/B Lecture Notes - Lecture 12: Ulna, Clavicle, Annular Ligament Of Radius

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The upper extremity: arm is made up of the shoulder shoulder girdle elbow radial ulnar joint and wrist. The glenoid fossa is a shallow depression in the lateral scapula. It is ringed by the rotator cuff made up of the tendons of the muscles that mobilize and stabilize the joint. There is not much space between the humeral head and the acromion of the scapula for the supraspinatus tendon to pass. This is where impingement can occur: this can start to cause muscle death, or rupture the bursa. The glenoid fossa is part of the scapula. But the scapula moves quite a lot with respect to the torso. The motion of the clavicle (aka collar bone) is tied to the scapular motion. These two bones form the shoulder girdle: shoulder girdle motion is the combined motion of 2 joints, sterno-clavicular joint, scapulo-thoracic joint.

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