Final answer:
The subject of this question is anatomy, specifically the muscles and ligaments of the thigh. The options provided are the inguinal ligament, sartorius muscle, and the medial border of the adductor muscle. The detailed answer provides a description and explanation of each option.
Step-by-step explanation:
The subject of this question is anatomy, specifically the muscles and ligaments of the thigh. Option 1, the inguinal ligament, is a ligament that runs from the anterior superior iliac spine to the pubic tubercle and helps to form the boundaries of the femoral triangle.
Option 2, the sartorius muscle, is a long, thin muscle that runs from the anterior superior iliac spine to the medial side of the tibia. It helps to flex, abduct, and laterally rotate the thigh, and flex the leg at the knee joint.
Option 3, the medial border of the adductor muscle, is not a term commonly used, but the adductor muscles mentioned in the reference materials include the adductor longus, adductor brevis, and adductor magnus. These muscles are located in the medial compartment of the thigh and act to adduct the thigh.