Common peroneal nerve and tibial Nerve

  1. Tibial N and common peroneal N are terminal branches of  sciatic N
  2. Superficial and deep peroneal(Ant.tibial n) are terminal branches of common peroneal N
  3. Tibial N—–>Medial and Lateral plantar nerves
  4. Common peroneal N and its terminal branches lie in close proximity to fibular head and neck.

Nerve Injuries

  1. Injury to common peroneal N——>Foot drop and inversion(Equinovarus)
  2. Injury to superficial peroneal N—->Inversion of foot
  3. Injury to deep peroneal N——>Foot drop
  4. Injury to tibial N——>Dorsiflexion and everion of foot at subtalar and trans tarsal joints(Calcaneovalgus)
  5. Tarsal tunnel syndrome —–>due to entrapment of Tibial N while passing deep to flexor retinaculum in between med malleolus and calcaneus.

Tip: Sciatic N neutral, it divides into Tibial N and Common peroneal N which have opposite actions.

Injury to Common peroneal N causes Equinovarus(Inversion and Foot drop/plantar flexion) which is exactly opposite to the injury to Tibial N,Calcaneovalgus(Eversion and Dorsiflexion).

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