Which one of the following muscles forms the medial border of the cubital fossa?

Question

BlackTom AI · Accepted Answer

To approach this question, first recall the anatomical boundaries of the cubital fossa and which muscles define those edges.
Option a: Supinator. This muscle surrounds the posterior aspect of the forearm and contributes more to the posterior boundary and the floor, not the medial border of the cubital fossa, so this choice is incorrect.
Option b: Brachialis. While the brachialis lies deep and contributes to the floor of the cubital fossa, it does not form the medial border; therefore this option is not correct.
Option c: Brachioradialis. The brachioradialis marks the lateral boundary of the cubital fossa, running along the forearm's lateral side, which makes this option incorrect for the medial border.
Option d: Extensor carpi radialis longus. This muscle is located laterally on the forearm and does not define the medial border of the fossa; thus it is not the correct choice.
Option e: Pronator teres. This muscle forms the medial boundary of the cubital fossa, lying along the medial edge between the forearm and upper arm, which correctly completes the fossa’s borders.
Therefore, the muscle forming the medial border is Pronator teres, as described in standard anatomical boundary relations of the cubital fossa.

Which one of the following muscles forms the medial border of the cubital fossa?Single choice

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