In the shoulder joint, the function of the _____________ is to deepen the cavity of the glenoid fossa. A. tendon of long head of biceps brachii B. coracohumeral ligament C. transverse humeral ligament D. glenoid labrum E. subscapular bursa
Question
In the shoulder joint, the function of the _____________ is to deepen the cavity of the glenoid fossa. A. tendon of long head of biceps brachii B. coracohumeral ligament C. transverse humeral ligament D. glenoid labrum E. subscapular bursa
Solution
The correct answer is D. Glenoid Labrum.
Here's the step by step explanation:
The shoulder joint is a ball and socket joint, consisting of the head of the humerus (the ball) and the glenoid fossa of the scapula (the socket).
The glenoid labrum is a fibrocartilaginous structure (made of fibrous and cartilage tissue) that is attached to the rim of the glenoid fossa. Its main function is to deepen the socket of the glenoid fossa and make it more concave. This helps to stabilize the shoulder joint by increasing the surface area of the socket and providing a better fit for the head of the humerus.
Therefore, the function of the glenoid labrum is to deepen the cavity of the glenoid fossa, making option D the correct answer.
The other options listed (A. tendon of long head of biceps brachii, B. coracohumeral ligament, C. transverse humeral ligament, E. subscapular bursa) all play important roles in the shoulder joint, but they do not serve to deepen the cavity of the glenoid fossa.
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