Biceps femoris muscle

Dr Jeremy Jones et al.

The biceps femoris is one of the large muscles in the posterior compartment of the thigh and a component of the hamstrings. It has a long and a short head, each with different functions and innervation.


  • origin
    • long head: tuberosity of the ischium
    • short head: linea aspera on the posterior femur
  • insertion: the head of the fibula that articulates with the lateral tibial condyle
  • action
    • flexes knee joint
    • laterally rotates knee joint (when the knee is flexed)
    • extends hip joint (long head only)
    • external rotation of the thigh (long head only)
  • arterial supply
  • innervation
  • antagonist: quadriceps
Lower limb anatomy
Share article

Article information

rID: 6031
Section: Anatomy
Tag: muscle
Synonyms or Alternate Spellings:
  • Biceps femoris muscles
  • Biceps femoris

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    Figure 1
    Drag here to reorder.
  • Drag
    Figure 2
    Drag here to reorder.
  • Drag
    Figure 3
    Drag here to reorder.
  • Drag
    Partial tear of B...
    Case 1: biceps femoris - partial tear
    Drag here to reorder.
  • Updating… Please wait.

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.