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biceps femoris
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Illustration of the human muscular system from a side view, showing detailed muscles throughout the body with labels identifying major muscles in the head, torso, arms, and legs. Anatomical illustration of a cat in side view with its trunk and limb muscles exposed and labeled, showing major muscle groups such as trapezius, latissimus dorsi, gluteus, and biceps femoris. Posterior anatomical illustration of the human muscular system showing major back, arm, and leg muscles labeled, including trapezius, latissimus dorsi, gluteus maximus, and gastrocnemius. Diagram showing the knee jerk reflex: a reflex hammer strikes the patellar tendon below the knee, activating a stretch receptor in the quadriceps muscle. This sends a signal through a sensory neuron to the spinal cord, where it connects to a motor neuron. The motor neuron then signals the muscle to contract, causing the lower leg to kick forward. The diagram also illustrates the pathway of sensory and motor neurons and their connection in the spinal cord.
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biceps femoris

anatomy
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Illustration of the human muscular system from a side view, showing detailed muscles throughout the body with labels identifying major muscles in the head, torso, arms, and legs.
Human muscular system Lateral view of the human muscular system.

The biceps femoris is one of the hamstring muscles located at the back of the thigh. It originates from the ischium and the back of the femur, joining together to attach to the fibula and tibia. This muscle plays a role in extending the thigh, rotating it outward, and flexing the leg at the knee. Hamstring injuries, including strains to the biceps femoris, are common, particularly in athletes, and can range from mild overstretching to complete tears of the muscle or tendon.12

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4 Britannica Sources
  1. biceps muscle
  2. quadriceps femoris muscle
  3. thigh: Top Questions
  4. hamstring

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