Final answer:
The adductor longus, adductor brevis, adductor magnus, and pectineus muscles can be used as guides in locating the femoral artery.
Step-by-step explanation:
The muscles that can be used as guides in locating the femoral artery are the adductor longus, adductor brevis, adductor magnus, and pectineus. These muscles are located in the femoral triangle, which is formed at the junction between the hip and the leg. The femoral artery runs through the femoral triangle along with other structures like the femoral vein and femoral nerve.