ANAT 101 Chapter Notes - Chapter 6: Olecranon Fossa, Shoulder Girdle, Lesser Tubercle

• School: Queen's University
• Department: Anatomy and Cell Biology
• Course: ANAT 101
• Professor: Richard Oko

Document Summary

6-8: the pectoral girdle and upper limb bones, and the pelvic girdle and lower limb. Each upper limb articulates (that is, forms a joint) with the trunk at the pectoral girdle, or shoulder girdle. The pectoral girdle consists of two broad, flat scapulae and two slender, curved clavicles. Each clavicle articulates with the manubrium, of the sternum; these are the only direct connections between the pectoral girdle and the axial skeleton. Skeletal muscles support and position each scapula, which has no bony or ligamentous connections to the thoracic cage. Once the shoulder joint is in position, muscles that originate on the pectoral girdle help to move the arm: the surfaces of the scapulae and clavicles are therefore extremely important as sites for muscle attachment. The clavicle: articulates with the manubrium of the sternum at its sternal end and with the acromion, a process of the scapula, at its acromial end, are relatively small and fragile.