NEET PG Medical – 2012 – Question – 48
Tibial nerve injury/palsy causes:
a) Dorsiflexion of foot at ankle joint
b) Planter flexion of the foot at ankle joint
c) Loss of sensation of dorsum of foot
d) Paralysis of muscles of anterior compartment of leg
Correct Answer – A
A i.e. Dorsiflexion of foot at ankle joint
* Tibial nerve (the larger component of sciatic nerve) supplies all muscles of posterior compartment of leg (gastrocnemius, soleus, plantaris, popliteus, tibialis posterior, FHL & FDL) plantar flexing the ankle & foot. Therefore, tibial nerve injury results in loss of planter flexion along with calcaneovalgus attitude of foot (i.e., dorsiflexion & eversion d/t unopposed anterior compartment muscles).
– Deep peroneal (fibular) nerve supplies all anterior leg compartment muscles (tibialis anterior, EHL, EDL, EDB, PT) dorsiflexing the ankle & foot.
– Sole is supplied by medial & lateral plantar and sural branches of tibial nerve anteriorly (from medial to lateral) and calcaneal branches of tibial nerve0 posteriorly (i.e. over heel).
– It then passes along lateral side of foot and little toe supplying the overlying skin.
– Anterolateral aspect of leg, and dorsum of foot including 2″ – 4th zveb spaces are supplied by superficial peroneal nerve.
– Whereas deep peroneal (fibular) nerve supplies 1st web space (i.e. adjacent sides of great and second toes)Q
