In the femoral triangle, which muscle borders the femoral artery laterally?

The correct choice is the sartorius muscle, which borders the femoral artery laterally within the femoral triangle. The femoral triangle is an anatomical region located in the upper thigh, and it is defined by three important structures: the inguinal ligament superiorly, the adductor longus medially, and the sartorius laterally.

The sartorius muscle is the longest muscle in the human body and runs diagonally across the thigh from its origin at the anterior superior iliac spine to its insertion on the medial side of the tibia. Its position places it laterally in relation to the femoral artery as it traverses through the femoral triangle.

Understanding this anatomical relationship is crucial for various clinical procedures, such as accessing the femoral artery for catheterization or performing surgical interventions in this area. The adductor longus muscle, which is located medially in the triangle, does not border the femoral artery laterally, while the flexor carpi ulnaris is a muscle of the forearm and therefore irrelevant to the femoral region. The quadriceps are a group of muscles situated more anteriorly and do not specifically border the femoral artery within the confines of the femoral triangle.