Lower Limb Nerves

Question 1

Lumbar plexus branches and roots

Answer 1

I i get laid on friday —2 from 1,2 from2,2 from 3 roots

Iliohypogastric
Ilioinguinal
Genitofemoral
Lateral femoral cutaneous
Obturator
Femoral

Question 2

Nerve supply of thigh

Sciatic nerve

Answer 2

Map  O F Sciatica 
 Sciatic nerve (l3l4s1s2s3) 
Branches are tibial nerve and common fibular nerve and it supplies 
muscles of leg and foot and
 posterior of compartment of thigh
And nearly entire skin of leg

Question 3

FEMoral nerve injury

Answer 3

Pelvic fracture

FEM flexion extension and medial leg sensory loss

Question 4

Obturator nerve injury

Answer 4

Pelvic Surgical(by operator) 
 Medial thigh sensory loss and adduction loss

Question 5

Iliohypogastric nerve

Genitofemoral nerve injury

Answer 5

Abdomin-ill surgery
Sensory loss of suprapubic region

Sensory loss of GENITALS scrotum n labia

Question 6

Lateral femoral cutaneous nerve injury

Answer 6

LFC lazy fat clothing
Caused by tight clothes
Sensory loss of anterior lateral thigh

Question 7

Sciatic nerve injury

Answer 7

Under piriformis therefore damaged by piriformis injury n sciatic herniation

All the leg+foot sensation except saphenous nerve is supplied by sciatic nerve and all motor functions of leg and foot are lost

Question 8

Common peroneal (fibular) nerve
Tibial nerve injury

Answer 8

Injury at fibular neck fracture or blow to lateral aspect of leg and when it passes through the piriformis muscle instead of passing inferior to it along with tibial n
PED—> peroneal everts dorsoflex
Foot drop n patient cant stand on
heals

Popliteal cyst-tarsal tunnel syndrome
TIap—> tibial inverts plantarflexes
Patient cannot stand on toes

Question 9

Superior gluteal nerve

Inferior gluteal nerve muscle innervations

Answer 9

Superior gluteal nerve is above the piriformis muscle and give innervations to gluteus minimus gluteus medialis and tensor fascia latae

Inferior g n comes below the piriformis musle
And innervates gluteus maximus

Question 10

Seperior gluteal nerve damaged

Inferior gluteal nerve

Answer 10

Caused by posterior hip dislocation and surgery
Causes waddling gait(mtk k chlna)
Positive trendelenburg sign
Patient cannot keep upper hip balance bcz when standing on one leg

Gluteus max do not work thus patient feels difficulty to stand from sitting position and weakness in climbing stairs

Question 11

Sensory innervation of leg and foot

Answer 11

Medial leg and medial foot is supplied by saphenous nerve(branch of femoral nerve)
Posterior leg and lateral foot is supplied by sural nerve(combination of both peroneal and tibial branch)
Dorsal foot is supplied by superficial fibular nerve except first dorsal web space which is supplied by deep fibular nerve
Sole of foot is supplied by medial and lateral branches of tibial nerve

Question 12

Medial circumflex femoral artery supplies

Perforating arteries supply

Answer 12

Head of femur(avascular necrosis)

Posterior thigh

Question 13

Innervations of sole of foot

Answer 13

Tibial nerve divides into medial and lateral plantar nerves
Medial plantar nerve is homologous to median nerve of hand and supplies LAFF muscles(lumbricals,adductor hallucis,flexor digitorum brevis and flexor hallucis brevis)
Lateral plantar nerve is homologous to ulnar nerve supplies all intrinsic muscles of sole except LAFF muscles

Question 14

Innervations of medial and anterior compartment of leg

Answer 14

Common fibular nerve divides into deep fibular nerve and superficial fibular nerve
Dfn supplies anterior compartment of leg
Sfn supplies lateral compartment of leg