Out of the given options, glenoid cavity is a part of the pectoral girdle. Pectoral girdle or Shoulder girdle is composed of two separate halves. Each half consists of the scapula of shoulder bone and clavicle or collar bone. At the junction of scapula and clavicle, there is a concave depression, called glenoid cavity, which articulates with the head of the humerus to form a ball and socket joint. Ilium, acetabulum and ischium are the parts of pelvic girdle.