Question

Which of the following is a part of pectoral girdle?
A) Glenoid Cavity
B) Sternum
C) Ilium
D) Acetabulum

Answer 1

Hint: It is a component of the shoulder. It is a thin, pyriform articular surface, which is situated on the lateral position of the scapula. It is directed crossways and forward and articulates with the head of the humerus; it is wider below than above and its vertical diameter is the longest.

Complete answer:
A pectoral girdle also known as shoulder girdle joins the bones of the upper limb to the axial skeleton.Both pectoral girdles are composed of two halves. Each part of the pectoral girdle consists of a scapula and clavicle. The glenoid cavity is a shallow, pyriform articular surface, which is situated on the lateral angle of the scapula. It articulates with the humerus to shape the shoulder joint. Thus the glenoid cavity is a part of the pectoral girdle.

The sternum is a bone that’s situated in the middle of your chest. It’s also sometimes referred to as the breastbone. Ilium is the highest and largest part of the hip bone and appears in most vertebrates involving mammals and birds. The acetabulum is curved on the surface of the pelvis. The head of the femur gathers with the pelvis at the acetabulum, figuring the hip joint.

Hence, the correct answer is option (A).

Note: This cavity structures the glenohumeral joint along with the humerus. This kind of joint is classified as a synovial, ball, and socket joint. The humerus is held in place inside the glenoid cavity with the help of the long head of the biceps tendon. This tendon creates on the superior margin of the glenoid cavity and circles over the shoulder, invigorating humerus against the cavity.