LE Nerves

Question 1

Femoral nerve: hip flexion, knee extension

Answer 1

Hip flexors:
psoas and iliacus (ileopsoas)
pectinus
sartorius

Quadriceps: knee extension
rectus femoris 
vastus lateralis
vastus intermedius
vastus medialis

MOI: pelvic fracture
decreased leg extension
decreased thigh flexion
decreased sensation at anterior thigh and medial leg

Question 2

Obturator nerve: thigh adduction

Answer 2

Hip adductors:
adductor magnus
adductor longus
adductor brevis

Knee flexor:
gracilis
pectineus
obturator externis

MOI: anterior dislocation of hip
decreased thigh adduction
decreased sensation of medial thigh

Question 3

Superior gluteal nerve: hip abduction, medial thigh rotation

Answer 3

Tensor fascia latae
Gluteus medius
Gluteus minimus

MOI: Posterior dislocation of hip
Polio

Check the Trendelenberg gait- contralateral leg drops when you stand on the leg ipsilateral to the lesion

Question 4

Inferior gluteal nerve: hip extension, lateral rotation of thigh

Answer 4

Gluteus maximus

MOI: posterior hip dislocation; can’t stand up from seated

Question 5

Sciatic nerve: hip extension, knee flexion, sensation at posterior aspect of thigh, gluteal region, lower leg except medial side via its branches (common fibular nerve, tibial nerve)

Answer 5

Hamstring:
Biceps femoris
Semitendinosus
Semimembranosus

Adductor magnus (obturator as well as tibial nerve innervation)

MOI or compression: intervertebral disc herniation, spinal stenosis, spondylolysthesis

Manifestation is low back/ butt pain
Check straight leg test

Question 6

Tibial nerve (comes off sciatic n.): sensation at the sole of the foot, plantar flexion, toe flexion, foot inversion

Answer 6

Plantar flexion:
Gastrocnemius
Soleus
Plantaris
Popliteus (muscle that unlocks the knee from extension)

Toe flexion
Flexor hallicus longus
Flexor digitorum longus

Foot inversion
Tibialis posterior

MOI: knee trauma

Question 7

Deep peroneal nerve aka fibular n (comes off common peroneal nerve branch of sciatic n.): dorsiflexion, foot eversion

Answer 7

Foot eversion:
peroneus tertius

Dorsiflexion:
Tibialis anterior
Extensor hallicus longus
Extensor digitorum longus

MOI: fibular neck fracture
Lateral knee injury –> foot drop

Question 8

Superficial peroneal nerve aka fibular n (comes off common peroneal nerve branch of sciatic n): foot eversion

Answer 8

Foot eversion:
peroneus longus
peroneus brevis

Question 9

Sacral plexus

Answer 9

Superior and inferior gemellus
Piriformis
Quadratus femoris

Question 10

Saphenous n

Answer 10

Medial leg sensation

Question 11

Dermatones

Answer 11

Anterior:
Belly button at T10, T11, T12, L1, L2, L3, L4, L5
S1 5th toe
S2, S3 genitalia

Posterior:
S5 rectum
S4, S2, S3, S1 off of S5 like a bullseye going down the back of the leg

T12, L1, L2, L3, L4, L5 back of the heel and lowback