From hips to toes.

Hip & thigh

Find the femur beneath the hip bone. Follow its shaft from the rounded head toward the knee.

Kneecaps

The patella sits in front of the distal femur. Only its bone surface is shown; this is not a complete knee model.

Lower leg

Compare tibia and fibula with the calf muscles behind them and anterior and lateral muscles leading toward the foot.

Ankle & foot

Each foot includes seven tarsal bones, five metatarsals and fourteen toe phalanges. Rotate to inspect the heel and arches.

Anterior thigh

Four muscles, one quadriceps group

Rectus femoris, vastus lateralis, vastus medialis and vastus intermedius work together to extend the knee. Rectus femoris also crosses the hip and contributes to hip flexion. Vastus intermedius lies deep to rectus femoris: isolate it to inspect the source model.

All four are available on both sides. These are static source meshes, not a simulation of contraction. Tendon boundaries are not separately selectable, and the surrounding soft tissues are incomplete.

• Right rectus femoris →
• Left rectus femoris →
• Right vastus lateralis →
• Left vastus lateralis →
• Right vastus medialis →
• Left vastus medialis →
• Right vastus intermedius →
• Left vastus intermedius →

Reading: OpenStax — Muscles of the Pelvic Girdle and Lower Limbs. Checked 19 October 2026; specialist anatomical review pending.

Posterior thigh

Meet the muscles behind the thigh

The posterior thigh group includes biceps femoris, semitendinosus and semimembranosus. These muscles help flex the knee. Switch to the back view and compare their paths toward the knee with the quadriceps on the front.

Biceps femoris is represented by separate long-head and short-head meshes. Each side therefore has four selectable parts, not four different muscles. Use Isolate for a closer look, then Show context to restore the surrounding structures.

• Right biceps femoris long head →
• Left biceps femoris long head →
• Right biceps femoris short head →
• Left biceps femoris short head →
• Right semitendinosus →
• Left semitendinosus →
• Right semimembranosus →
• Left semimembranosus →

Reading: OpenStax — Thigh muscles. Source models: BodyParts3D / DBCLS. Checked 19 October 2026; specialist anatomical review pending. These static surfaces do not demonstrate muscle contraction or replace a complete dissection.

Calf muscles

From the knee toward the heel

Gastrocnemius and soleus help point the foot downward at the ankle (plantar flexion). Gastrocnemius also assists knee flexion. The broad soleus lies deep to gastrocnemius; isolate it to see the surface that is normally partly covered.

Each side has three selectable source parts: medial and lateral heads of gastrocnemius, plus soleus. This is not the complete posterior compartment. Plantaris is not yet included; the Achilles tendon is not a separately selectable structure.

• Right gastrocnemius medial head →
• Left gastrocnemius medial head →
• Right gastrocnemius lateral head →
• Left gastrocnemius lateral head →
• Right soleus →
• Left soleus →

Reading: OpenStax — Muscles that move the feet and toes. Source geometry: BodyParts3D / DBCLS. Checked 19 October 2026; specialist anatomical review pending. Static model, not a movement simulation.

Anterior lower leg

Follow the muscles toward the toes

Tibialis anterior helps lift the front of the foot at the ankle. Extensor hallucis longus extends the big toe, while extensor digitorum longus extends the other toes; both also assist dorsiflexion. Fibularis tertius is included in this source model, but is not present in every person.

Start with a front view, then isolate each muscle and rotate toward the foot. All four muscles are available on both sides. Tendon portions retain the muscle color and are not independently selectable. Retinacula, nerves, vessels and many surrounding muscles are still absent.

• Right tibialis anterior →
• Left tibialis anterior →
• Right extensor hallucis longus →
• Left extensor hallucis longus →
• Right extensor digitorum longus →
• Left extensor digitorum longus →
• Right fibularis tertius →
• Left fibularis tertius →

Reading: OpenStax — Anterior compartment of the leg. Geometry: BodyParts3D / DBCLS. Checked 19 October 2026; specialist review pending. Static educational model, not a simulation of movement.

Lateral lower leg

Along the outside of the leg

Fibularis longus and fibularis brevis form the lateral muscle compartment of the leg. Both help turn the sole outward (eversion) and point the foot downward (plantar flexion). Longus begins higher on the fibula; brevis begins farther down its shaft.

Use the lateral study shortcuts to isolate either muscle, then rotate toward the ankle and foot. Compare the long and short muscle paths on both sides. These muscles are also called peroneus longus and peroneus brevis. Tendon portions share the muscle color; separate tendon selection and retinacula are not included.

• Right fibularis longus →
• Left fibularis longus →
• Right fibularis brevis →
• Left fibularis brevis →

Reading: OpenStax — Lateral compartment of the leg. Geometry: BodyParts3D / DBCLS. Checked 19 October 2026; specialist review pending. Static educational model, not a movement simulation.

Deep posterior compartment

Beneath the calf

Tibialis posterior helps point the foot downward. Flexor digitorum longus bends the smaller toes, while flexor hallucis longus bends the big toe. Popliteus acts at the knee, assisting flexion and rotation rather than moving the toes.

Open “Deep posterior muscles” above the model to isolate one structure. Start from the back, then rotate toward the ankle or sole. The deep muscles can be hidden by the superficial calf in a full-context view. Tendon portions keep the muscle color and cannot be selected separately.

• Right tibialis posterior →
• Left tibialis posterior →
• Right flexor digitorum longus →
• Left flexor digitorum longus →
• Right flexor hallucis longus →
• Left flexor hallucis longus →
• Right popliteus →
• Left popliteus →

Reading: OpenStax — Deep posterior muscles of the leg. Geometry: BodyParts3D / DBCLS. Checked 19 October 2026; specialist review pending.

Plantaris, intrinsic foot muscles, retinacula, nerves and vessels are not included. Static educational model, not a complete dissection or movement simulation.