The Adductor Group and Lateral Rotator Groups
The muscles responsible for bringing the thighs together during adduction, which is the movement towards the inner line of the body, make up the adductor group. This group includes the adductor brevis, adductor longus, adductor magnus, pectineus, gracilis, and the obturator externus. Originating from the pubis, these muscles extend to the inner areas of the thighs.
The lateral rotator group is comprised of six muscles that have the ability to laterally rotate the femur in the hip joint. These muscles are the gemellus superior, gemellus inferior, piriformis, obturator internus, obturator externus, and quadratus femoris. All of these muscles originate from the hip bone and attach to the upper femur.
Anterior Thigh Muscles
The anterior thigh is home to some of the largest and most robust muscles in the human body. Two major muscles found in this region are the sartorius muscle and the quadriceps femoris.
The sartorius muscle, known as the longest muscle in the human body, runs diagonally from the upper middle to the lower inner thigh. Acting as a synergist muscle, it assists other muscles in the movement of the hip and knee joints.
The quadriceps femoris, on the other hand, consists of four individual muscles: the rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis. Together, these muscles function as powerful extensors for the knee joint. They encompass a significant portion of the front and sides of the femur.