A person suffers a dislocation of the shoulder joint where the head of the humerus articulates with the pectoral girdle. Identify the specific articular cavity of the girdle involved and the type of joint it forms with the humerus.

Step-by-step solution

The pectoral girdle consists of a clavicle and a scapula. The scapula features a depression called the glenoid cavity, which articulates with the head of the humerus to form the shoulder joint. This articulation is a ball and socket joint, a type of synovial joint that allows considerable movement. The acetabulum is a cavity found in the pelvic girdle, which articulates with the head of the femur to form the hip joint. A hinge joint is found at the knee or elbow, and a pivot joint is found between the atlas and axi