Final answer:
The sartorius, gracilis, and semitendinosus muscles all insert into the pes anserinus on the medial surface of the tibia, playing roles in knee and hip joint movement.
Step-by-step explanation:
The three muscles that insert onto the medial surface of the tibia at the pes anserinus are the sartorius, gracilis, and semitendinosus. These muscles work synergistically to perform several functions, including flexion and internal rotation of the knee, as well as acting on the hip joint.
The three muscles that insert into the same spot (medial surface of tibia/ pes ansurines) are the adductor longus, adductor brevis, and adductor magnus. These muscles are located in the medial compartment of the thigh and are responsible for adducting the femur at the hip. They also have secondary actions such as flexion and extension of the thigh.