Biceps Femoris
Biceps Femoris is one of the three muscles which form the hamstring group forming the back of the thigh. The muscle is often described as having a long head (the attachment from the ischium) and a short head (attached to the femur).
Origin
- Tuberosity of the ischium.
- Lower 1/2 of the linea aspera of the femur.
- Lateral supracondylar ridge.
Insertion
- Lateral condyle of the tibia.
- Head of the fibula.
Actions
- Hip extension.
- Knee flexion.
- Lateral rotation of the hip when the knee is flexed.
Innervation
- Tibial part of the sciatic nerve.
Daily uses
- Bending the knee to step over something.
Example strengthening exercises
- Knee curl machine.
- Squat.
- Leg press machine.
Example stretches
- Standing hamstring stretch.
- Sitting hamstring stretch.
- Partner hamstring stretch.
Related injuries
- Hamstring strain.
Related muscles
- Semimembranosus.
- Semitendinosus.
