Left biceps femoris long head

Identify biceps femoris long head

The long head is part of biceps femoris on the lateral side of the posterior thigh.

The long head crosses the hip; the short head begins on the femur. They are two heads of one muscle, not interchangeable structures.

Sources: Posterior thigh anatomy tables · Posterior thigh teaching notes

Principal attachments

It starts at the ischial tuberosity and joins the biceps femoris distal attachment, principally at the fibular head.

Use Show context on this structure page to reveal the same-side bones. Attachment areas named in the text are not separately clickable landmarks.

Sources: Posterior thigh anatomy tables

Function and joint crossing

It bends the knee and contributes to hip extension.

This is a static surface study. Camera controls do not simulate muscle shortening, joint rotation or a measured range of motion.

Sources: Posterior thigh teaching notes

Innervation

Motor supply: tibial division of the sciatic nerve.

Nerves and blood vessels are absent from the current model. This text is not a patient-specific nerve map.

Sources: Posterior thigh teaching notes

Read the model

Explore left biceps femoris long head in 3D

1. Look from behind. Choose Back, then follow the mesh from the hip bone toward the outside of the knee. Compare it with the short head using the links below.
2. Restore the same leg. Show context restores 31 bones and 21 muscle parts on this side. Use Focus selection to return attention to the chosen structure.
3. Compare the posterior group. The regional thigh close-up omits the tibia and fibula; use this full-leg structure page when inspecting distal attachment context. Left posterior thigh guides →

Sources and editorial status

This guide uses independently written explanations with links to the evidence behind them. Source checking and specialist anatomical review are separate steps; the latter is still pending.

1. Texas Tech University Health Sciences Center El Paso — Hip, posterior thigh and leg anatomy tables

   Principal attachments and medial/lateral relationships. These short descriptions are not an exhaustive list of tendon expansions.

2. Texas Tech University Health Sciences Center El Paso — Hip and posterior thigh dissector answers

   Posterior thigh group, the short-head exception and tibial versus common fibular divisions. No source text or dissection photographs are reproduced.

3D geometry and its separate license are credited beneath the viewer. References do not imply endorsement of this site.