nerves
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overview


Major Nerve Source

  • Sciatic Nerve (L4–S3) Largest nerve in the body Travels from lower back → glutes → down the leg Splits into two main branches: Tibial nerveCommon fibular (peroneal) nerve


Posterior Leg (Back of Leg & Foot)

Tibial Nerve

  • Path: Runs down back of leg → behind medial ankle → into foot

  • Function: Plantarflexion (pointing foot) Toe flexion Sensation to bottom of foot

  • Role: Push-off strength, walking, balance

Anterior & Lateral Leg

Common Fibular (Peroneal) Nerve

  • Splits into:

Deep Fibular Nerve

  • Function: Dorsiflexion (lifting foot) Toe extension

  • Role: Prevents foot drop; controls walking mechanics

Superficial Fibular Nerve

  • Function: Foot eversion Sensation to top of foot

  • Role: Lateral stability and balance


Foot Nerves

Medial Plantar Nerve

  • Function: Sensation to medial (inner) foot; controls intrinsic muscles

  • Role: Fine motor control

Lateral Plantar Nerve

  • Function: Supplies lateral foot and intrinsic muscles

  • Role: Foot stability and coordination