PHTY101 Lecture Notes - Lecture 2: Serratus Anterior Muscle, Upper Extremity Of Humerus, Shoulder Joint
Document Summary
2. 2 specifically describe the functional roles of the rotator cuff muscle group in providing dynamic stability at the shoulder joint. To provide dynamic stability at the shoulder joint by: Taking up slack in the shoulder joint capsule during movement, Providing a medial force to the humeral head to accurately position it in the center of the glenoid fossa during shoulder movement. 2. 3 specifically describe the functional roles of trapezius and serratus anterior during lateral rotation of the scapula. Lateral rotation of the scapula: accompanies abduction of the shoulder joint. Increases movement of the glenoid fossa thus increasing the mobility of the shoulder. Repositions the rc muscles enabling them to provide and appropriate stabilising force to the humeral head throughout shoulder range of movement. Action of trapezius and serratus anterior work together to provide lateral rotation. 2. 6 list the features of the shoulder joint which contribute to its: stability. Orientation of the glenoid fossa: glenoid fossa angled superiorly in neutral.
