Which of the following structures travel through the quadrangular space around the shoulder / axilla?

Question

BlackTom AI · Accepted Answer

To tackle this question, I will list what travels through the quadrangular space and then evaluate each option accordingly.
Option 1: Cephalic Vein. The cephalic vein courses superficially along the lateral aspect of the arm and forearm, passing near the deltopectoral groove, but it does not pass through the quadrangular space. Therefore this option is incorrect.
Option 2: None of these structures travel through the quadrangular space. This would be true only if every listed structure did not pass through it, but we know that one structure in the list (the axillary nerve) does travel through the quadrangular space, so this statement is false.
Option 3: Axillary artery. The axillary artery is a major vessel that changes name as it passes teres major and continues as the brachial artery distally. Its branches relevant to the shoulder region include the posterior circumflex humeral artery, which traverses the quadrangular space, but the main axillary artery itself does not travel through the quadrangular space. Thus, this option is incorrect because the primary axillary artery is not the structure that passes through the space.
Option 4: Anterior Circumflex Humeral Artery. This artery generally courses around the surgical neck anteriorly and does not pass through the quadrangular space; its relationship is distinct from the contents of the space. Therefore, this option is incorrect.
Option 5: Axillary Nerve. The axillary nerve is a classic and well-established content of the quadrangular space, along with the posterior circumflex humeral artery. It supplies the deltoid and teres minor and passes through the space with the artery, making this the correct choice.
In summary, only the axillary nerve is a recognized structure that travels through the quadrangular space, while the other options do not. The reasoning hinges on the known anatomy of the quadrangular space contents and differentiates them from adjacent vascular courses around the shoulder region.

Which of the following structures travel through the quadrangular space around the shoulder / axilla? 单项选择题

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