anterior muscles
vastus lateralis
it covers the outer anterior aspect of the femur, arises chiefly from the femur, and inserts into the outer border of the patella by a flat tendon which blends with that of the other divisions of the muscle and sends an expansion to the capsule of the knee. The vastus lateralis muscle is located on the side of the thigh. Collectively, the quadriceps muscle is the largest in the human body and its purpose is to extend the knee. The specific task of the vastus lateralis muscle is to extend the lower leg and allow the body to rise up from a squatting position.
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vastus intermedius
The vastus intermedius muscle is located along the upper portion of the femur, which is also known as the thighbone. This muscle covers the front part of the femur and the side of the femur. It is directly underneath and ends at the rectus femoris muscle, which is part of the quadriceps cluster of muscles.
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vastus medialis
vastus medialis muscle is a part of the quadriceps muscle group, located on the front of the thigh. It is the most medial, or inner, of the quadriceps muscles. It extends the entire length of the thigh. The portion of the muscle that is just above the knee is sometimes referred to as the vastus medialis obliquus, or VMO. This muscle is used to extend the leg at the knee and to stabilize the patella, which is also known as the kneecap.
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vastus femoris
it is the last of quadriceps muscles. origin- anterior inferior iliac spine insertion- tibial tuberosity by the patellar ligament function- extends knee flexes hip
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gracilis
The gracilis muscle is one of the muscles found in the groin.It starts at the external point of the ischiopubic ramus (on the pubic bone) and extends down to the upper medial (middle) shaft of the tibia, or shinbone. The gracilis is responsible for hip adduction and assists knee flexion
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sartorius
Long and thin, the sartorius muscle spans the distance of the thigh. It originates at anterior superior iliac spine (a bony projection on the uppermost part of the pelvis) and travels to the upper shaft of the tibia, or shinbone. As such, the sartorius is the longest muscle in the human body.The muscle helps flex, adduct, and rotate the hip. In addition, it helps with the knee's flexion
quadricep muscle
The Rectus femoris muscle has two origins at the anterior inferior iliac spine of the pelvis and the upper margin of the acetabulum. Distally its fibers end in the common insertion tendon (quadriceps tendon) Function: Extends the knee joint and stabilizes the patella.
