Question24 Which one of the following statements about the cubital fossa is correct? The most lateral structure in the fossa is the brachial artery The floor of the fossa is formed by the supinator and brachialis The medial border is formed by the lateral border of pronator quadratus The median cubital artery is often used to collect blood The most medial structure in the fossa is the tendon of biceps brachii ResetMaximum marks: 1 Flag question undefined

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BlackTom AI · Accepted Answer

Question details: We are evaluating which statement about the cubital fossa is correct. Here are the options analyzed one by one.

Option 1: "The most lateral structure in the fossa is the brachial artery." In the cubital fossa, the arrangement from lateral to medial is typically radial nerve (laterally), biceps tendon, brachial artery, and median nerve more medially. The brachial artery is not the most lateral structure; it lies medial to the biceps tendon and radial nerve. Therefore this claim is not accurate.

Option 2: "The floor of the fossa is formed by the supinator and brachialis." This statement aligns with standard anatomical description: the floor (or base) of the cubital fossa is formed by the tendinous and muscular attachments of the brachialis and the supinator as you pass from medial to lateral. This combination forms the floor of the fossa, which makes this option consistent with anatomical knowledge.

Option 3: "The medial border is formed by the lateral border of pronator quadratus." The medial border of the cubital fossa is actually formed by the pronator teres muscle, not by pronator quadratus. The lateral border is formed by the brachioradialis. Since this statement mismatches the actual borders, it is incorrect.

Option 4: "The median cubital artery is often used to collect blood." The common site for venipuncture is the median cubital vein, not an artery. The median cubital artery is not typically used for blood collection and is not a standard landmark for venipuncture. This makes the claim false.

Option 5: "The most medial structure in the fossa is the tendon of biceps brachii." In the cubital fossa, the tendon of biceps brachii is located more medially but not at the very medial limit; the relative positions are tendinous structure more anterior and lateral to some nerves depending on view. Describing it as the most medial is inconsistent with the typical anterior-posterior and medial-lateral relationships, making this statement inaccurate.

Overall reasoning: evaluating the spatial relationships in the cubital fossa is essential. The correct understanding hinges on the precise layout: lateral to medial content order, floor formation, and venous/arterial landmarks. The statement about the floor being formed by the supinator and brachialis corresponds with the established anatomical description, while the other options mix up borders, structures, or typical clinical landmarks. This diagnostic approach helps distinguish accurate from inaccurate sustainability of each claim.

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