While carrying a heavy suitcase, the downward dislocation of the glenohumeral joint is resisted by all of the following muscles except:

Question

Image below highlights jugular foramen. Which of the following structures do not pass through the marked structure “A”?

Answer 1

This question asks which muscles do NOT help stop the humeral head from slipping down out of the glenoid cavity when a heavy weight loads the arm, as when carrying a suitcase.

Deltoid: Runs almost vertically over the shoulder from the scapular spine and clavicle to the humerus. Its tone is one of the main forces holding the head up against the glenoid, so it does resist downward slip.
Coracobrachialis: Starts on the coracoid process and runs down and medially to the humeral shaft. Its pull is oblique rather than vertical, so it gives little real support against the head dropping down, and the accepted key marks it as one of the two exceptions.
Short head of biceps: Also starts on the coracoid process and crosses two joints down to the radius. Like coracobrachialis, its line of pull is oblique, so it too is marked as an exception in the accepted key.
Latissimus dorsi: A broad adductor and medial rotator running from the trunk up to the front of the humerus. The accepted key groups it with deltoid as contributing to resisting inferior displacement, though this is one of the weaker, more debated parts of the answer.

Because two options, coracobrachialis and short head of biceps, are both accepted as not resisting downward dislocation, this question is treated as a multiple correct answer item, matching the original paper's own "2/3" key.

Let's summarize:

Deltoid and supraspinatus type vertical fibre muscles resist inferior dislocation the most.
Coracobrachialis and short head of biceps pull more obliquely and are the accepted exceptions here.

So the answer is coracobrachialis and short head of biceps.

Answer 2

This question asks which muscles do NOT help stop the humeral head from slipping down out of the glenoid cavity when a heavy weight loads the arm, as when carrying a suitcase.

Deltoid: Runs almost vertically over the shoulder from the scapular spine and clavicle to the humerus. Its tone is one of the main forces holding the head up against the glenoid, so it does resist downward slip.
Coracobrachialis: Starts on the coracoid process and runs down and medially to the humeral shaft. Its pull is oblique rather than vertical, so it gives little real support against the head dropping down, and the accepted key marks it as one of the two exceptions.
Short head of biceps: Also starts on the coracoid process and crosses two joints down to the radius. Like coracobrachialis, its line of pull is oblique, so it too is marked as an exception in the accepted key.
Latissimus dorsi: A broad adductor and medial rotator running from the trunk up to the front of the humerus. The accepted key groups it with deltoid as contributing to resisting inferior displacement, though this is one of the weaker, more debated parts of the answer.

Because two options, coracobrachialis and short head of biceps, are both accepted as not resisting downward dislocation, this question is treated as a multiple correct answer item, matching the original paper's own "2/3" key.

Let's summarize:

Deltoid and supraspinatus type vertical fibre muscles resist inferior dislocation the most.
Coracobrachialis and short head of biceps pull more obliquely and are the accepted exceptions here.

So the answer is coracobrachialis and short head of biceps.

While carrying a heavy suitcase, the downward dislocation of the glenohumeral joint is resisted by all of the following muscles except:

Show Hint

The Correct Option is B, C

Solution and Explanation

Questions Asked in NEET (PG) exam