Final answer:
The hamstring muscles are located in the posterior compartment of the thigh and have multiple functions.
Step-by-step explanation:
The muscles described in the question are the hamstring muscles located in the posterior compartment of the thigh.
These muscles include the biceps femoris, semitendinosus, and semimembranosus. They originate from the ischial tuberosity of the pelvis and insert onto the tibia and fibula.
The main actions of the hamstring muscles are to bend the knee, extend the hip, and rotate the thigh inward.