What is the purpose of the glenoid cavity in the scapula?

The pectoral and pelvic girdle bones help in the articulation of the upper and the lower limbs respectively with the axial skeleton.Each half of the pectoral girdle consists of a clavicle and a scapula.The acromion is a slightly elevated ridge in the scapula that projects as a flat, expanded process and articulates with the clavicle.The glenoid cavity in the scapula articulates with the head of the humerus to form the shoulder joint.The human body consists of 206 bones in total. These bones are grouped into two main divisions - the axial skeleton and the appendicular skeleton. The skull is composed of two sets of bones, cranial and facial, that total to 22 bones.Each vertebra has a central hollow portion (neural canal) through which the spinal cord passes. The vertebral column is differentiated into cervical (7), thoracic (12), lumbar (5), sacral (1-fused) and coccygeal (1-fused) regions.