Anatomy and Cell Biology 3319 Lecture Notes - Lecture 35: Shoulder Girdle, Axial Skeleton, Supraspinatus Muscle
6 May 2019
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Lecture #36 february 19th, 2019: the pectoral girdle. Consists of: scapula (posterior, clavicle (anterior) The name itself is a misnomer since the 2 scapulae do not physically meet on the back (i. e. not a true. Functions: provides attachment for the ul to the axial skeleton, provides great movement flexibility in various planes. Movements of the scapula: elevation (shrugging shoulders) and depression, protraction (like a punching movement) and retraction (standing at attention, upward and downward rotation (as in moving arms over head, and down again) Posterior muscles: trapezius stabilizes, raises, retracts and rotates scapula, levator scapulae elevates and retracts scapula, rhomboids stabilizes and helps retract the scapula. Anterior muscles: pectoralis minor draws scapula forward, serratus anterior rotates scapula lateral and upward; important role in raising the arm and horizontal arm movements (pushing, punching, subclavius helps stabilize and depress pectoral girdle (ignore) Subscapularis: primary medial rotator of the humerus, holds head of humerus in glenoid cavity stabilizing shoulder joint.
