Question

Glenoid cavity articulates
a. Clavicle with scapula
b. Humerus with scapula
c. Clavicle with acromion
d. Scapula with acromion

Answer 1

Hint: The glenoid cavity is a structural feature on the scapula bone. Scapula and clavicle are the two bones which constitute the pectoral girdle. These bones along with humerus form the shoulder.

Complete answer:
The scapula is a triangular bone also called the shoulder blade. On its lateral angle is found a shallow cavity called the glenoid cavity which forms the structural feature of the scapula. The upper arm bone is called the humerus. It has an upper rounded end which forms the head of the humerus. This head articulates into the glenoid cavity of the scapula to form the glenohumeral joint or the shoulder joint. It is a synovial or ball and socket joint which facilitates the free and easy movement of our hands. This joint is provided stability by glenohumeral ligaments and muscles. The biceps brachii is a tendon found on the superior margin of glenoid cavity. It loops over the shoulder and holds the humerus tightly within the glenoid cavity. The rotator cuff muscles provide further reinforcement to the joint. The acromioclavicular joint is a joint formed when the clavicle articulates with the acromion of the scapula. This forms the roof of the shoulder.

Hence, the correct answer is option (B).

Note: The glenoid cavity is irregularly oval and appears like an inverted comma. The margin of glenoid cavity is slightly raised due to the presence of a wedge-shaped fibrocartilaginous structure called the glenoid labrum. This deepens the glenoid cavity and provides stability to the glenohumeral joint. The glenohumeral joint or the shoulder joint is easily susceptible to dislocation.