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Muscles of the leg

The anterior group

Tibialis anterior (m. tibialis anterior/передняя большеберцовая мышца)

  • Origin. From the lateral surface of the tibia.

  • Insertion. To the base of the 1 st metatarsal and the medial cuneiform.

  • Actions. Dorsiflexion and inversion of the foot.

  • Nerve supply. Deep peronal nerve.

Extensor hallucis longus (m. extensor hallucis longus/длинный разгибатель большого пальца стопы)

  • Origin. From the middle third of the shaft of the fibula.

  • Insertion. To the base of the distal phalanx of the big toe.

  • Actions. Extension of the big toe and dorsiflexion of the foot.

  • Nerve supply. Deep peroneal nerve.

Extensor digitorum longus (m. extensor digitorum longus/длинный разгибатель пальцев)

  • Origin. From the shaft of the fibula.

  • Insertion. To the bases of the middle and distal phalanges of the four lateral toes via the dorsal extensor expansions.

  • Actions. Fxtension of the toes and dorsiflexion of the foot.

  • Nerve supply. Deep peroneal nerve.

Fibularis tertius (m. fibularis tertius/третья малоберцовая мышца)

  • Origin. Formed by the lower part of extensor digitorum longus.

  • Insertion. Into the base of the 5th metatarsal.

  • Action. Dorsiflexion of the foot.

  • Nerve supply. Deep peroneal nerve.

The lateral group

Fibularis longus (m. fibularis longus/длинная малоберцовая мышца)

  • Origin. From the upper two-thirds of the lateral surface of the shaft of the fibula.

  • Insertion. To the base of the 1st metatarsal and the medial cuneiform.via the groove on the cuboid.

  • Action. Eversion of the foot.

  • Nerve supply. Superficial peroneal nerve.

Fibularis brevis (m. fibularis brevis/короткая малоберцовая мышца)

  • Origin. From the lower two-thirds of the shaft of the fibula.

  • Insertion. To the base of the 5th metatarsal.

  • Action. Eversion of the foot.

  • Nerve supply. Superficial peroneal nerve.

The posterior group

The superficial layer

Gastrocnemius (m. gastrocnemius/икроножная мышца)

  • Origin. From the femur just above both femoral condyles.

  • Insertion. To the middle third of the back of the calcaneus via the calcaneal tendon.

  • Actions. Plantar flexion of the foot; weak flexion of the knee.

  • Nerve supply. Tibial nerve.

Soleus (m. soleus/камбаловидная мышца)

  • Origin. From the soleal line of the tibia and the upper part of the back of the fibula.

  • Insertion. To the middle third of the back of the calcaneus via the calcaneal tendon in common with the gastrocnemius.

  • Actions. Plantar flexion of the foot. Is the main factor in the ‘muscle pump’.

  • Nerve supply. Tibial nerve.

Plantaris (m. plantaris/подошвенная мышца)

  • A detached piece of the lateral head of gastrocnemius with similar properties.

Popliteus (m. popliteus/подколенная мышца)

  • Origin. From the back of the tibia above the soleal line.

  • Insertion. To the lateral condyle of the femur.

  • Actions. Flexion and medial rotation of the leg (thus ‘unlocking’ the extended knee joint).

  • Nerve supply. Tibial nerve.

The deep layer