BIOSC-139 Lecture Notes - Lecture 11: Shoulder Girdle, Axial Skeleton, Shoulder Joint

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Bones: part 2: the appendicular skeleton: identify the bones that form the pectoral girdle, and explain their functions. Consists of the clavicle and the scapula. Pectoral girdles do not quite encircle the body completely. Medial end of each clavicle articulates with the manubrium and first rib. Laterally the ends of the clavicles join the scapulae. Scapulae do not join each other or the axial skeleton. Provides attachment for many muscles that move the upper limb. Girdle is very light and upper limbs are mobile. Only clavicle articulates with the axial skeleton. Socket of the shoulder joint (glenoid cavity) is shallow. Good for flexibility, bad for stability: identify the important bone features on the scapula and clavicle. Transmit compression forces from the upper limbs to the axial skeleton. Lie on the dorsal surface of the rib cage. Lateral, superior, and inferior: identify the bones of the upper limb and their important features, and describe how they articulate with each other.

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