Twenty-three individual muscles originate from or attach to the femur. Three of the four quadriceps in the thigh begin here: the vastus lateralis, vastus medialis, and vastus intermedius on the front of the thigh. These muscles allow the knees to straighten from a bent position. Other important muscles that originate from the femur include the popliteus muscle that unlocks the knee and the gastrocnemius which allows the knee and ankle to flex.

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.