Sciatic Nerve Lesions

Question 1

Pathway- sciatic nerve lesions

Answer 1

-extends from L4 to S3 of the lumbosacral plexus
-it passes out of the pelvis through the greater sciatic foramen below the Piriformis
-then travels between the greater trochanter + the ischial tuberosity
-along the posterior thigh following adductor magnus down the leg
-through popliteal fossa and bifurcates into the Tibial + Peroneal nerves

Question 2

Muscles innervated by the sciatic nerve

Answer 2

-Hams
-1/2 of adductor magnus
●Tibial division
-GN/SOL
-plantaris
-popliteus
-tib post
-Flexor Digitorum longus
-Flexor hallicus longus
-intrinsic foot mms
●common Peroneal division
-extensor longus/ brevis
-extensor Digitorum longus/ brevis
-tib ant
-Peroneal longus tertius

Question 3

Drop foot

Answer 3

Paralysis in dorsiflexion + evertors causes foot to hang in plantar flexion + inversion

Question 4

Claw toe

Answer 4

Due to loss of Intrinsic foot muscles with Tibial nerve lesion leading to hyperextension of the MTP jt + flexion IP jts