lower extremity nerves + muscles + compartments

Question 1

psoas, iliacus (both = illiopsoas), pectineus, sartorius (3 hip flexors)
vastus lateralis, vastus intermedius, vastus medialis, rectus femoris (knee extension = quads)

Answer 1

motor innervation of femoral nerve

need femorAL to kick a BALL

Question 2

sensory innervation of:
anterior thigh
medial lower leg

Answer 2

femoral nerve

Question 3

loss of thigh flexion + leg extension

↓ sensation to anterior thigh + medial lower leg

Answer 3

femoral nerve injury:

pelvic fracture

Question 4

adductor magnues, adductor longus, adductor brevis (thigh adduction)
gracilis (knee flexion)

Answer 4

motor innervation of obturator nerve

Question 5

sensory innervation of:

medial thigh

Answer 5

obturator nerve

Question 6

loss of thigh adduction

↓ sensation to medial thigh

Answer 6

obturator nerve injury:

ANTERIOR dislocation of hip

Question 7

tensor fascia latae, gluteus medius, gluteus minimus (hip abduction and medial rotation of thigh)

Answer 7

motor innervation of superior gluteal nerve

Question 8

trendelenburg gait:

normal: lift leg - standing leg (opposite leg) glut contracts
injury: contralateral hip drops, ispilateral to standing leg (no hip aduction)

Answer 8

superior gluteal nerve injury:
POSTERIOR hip dislocation OR
polio

Question 9

gluteus maximus (hip extension + lateral rotation of thigh)

Answer 9

motor innervation of inferior gluteal nerve

Question 10

difficulty standing up or climbing stairs or walking

Answer 10

inferior gluteal nerve injury:
POSTERIOR hip dislocation OR
posterior approach during hip replacement surgery

Question 11

biceps femoris, semitendinosus, semimembranosus, (3 = hamstrings), adductor magnus (hip extension and knee flexion)

Answer 11

motor innervation of sciatic nerve (tibial branch)

Question 12

sensory innervation of:
posterior thigh and gluteal regions
entire lower leg except medial aspect

Answer 12

sciatic nerve

Question 13

calf muscles:
gastrocnemius, soleus, plantaris (plantar flexion)
popliteus (unlocks knee when in extension)
flexor hallucis longus, flexor digitorum longus (toe flexion)
tibialis posterior (inversion of foot)

Answer 13

motor innervation of tibial nerve

Question 14

sensory innervation of:
sole of foot
back of calf

Answer 14

tibial nerve

back of calf = sural nerve

Question 15

pain in lower back/buttock that travels down leg

+ straight leg test

Answer 15

sciatic nerve injury:
intervertebral disc herniation
spinal stenosis
spondylolisthesis

Question 16

loss of sensation of SOLE OF FOOT

Answer 16

tibial nerve injury:

knee injury

Question 17

peroneus longus, peroneus brevis, short head of biceps femoris

Answer 17

motor innervation of common fibular nerve (common peroneal nerve)

Question 18

sensory innervation of:
lateral lower leg
dorsal side of foot

Answer 18

common fibular nerve (common peroneal nerve)

Question 19

foot drop (loss of dorsiflexion)
peroneal neuropathy (from prolonged bed rest or habitual leg crossing)

Answer 19

common fibular nerve injury:
chronic compression
habitual leg crossing
fracture of NECK of fibula

Question 20

peroneus tertius (foot eversion)
tibialis anterior, extensor hallucis longus, extensor digitorum longus (foot dorsiflexion)

Answer 20

motor innervation of deep fibular nerve (deep peroneal nerve)

Question 21

sensory innervation of:

webbing between first and second digits

Answer 21

deep fibular nerve (deep peroneal nerve)

Question 22

foot drop

Answer 22

deep fibular nerve (deep peroneal nerve) injury:

trauma to LATERAL knee

Question 23

branches of femoral nerve

Answer 23

1) tibial nerve (posterior compartment of leg)

2) common fibular nerve (anterior + lateral compartment of leg)

Question 24

adductor magnus m. is innervated by

Answer 24

obturator nerve

tibial nerve

Question 25

branches of tibial nerve

Answer 25

1) sural nerve
2) medial plantar nerve (foot)
3) lateral plantar nerve (foot)

Question 26

branches of common fibular nerve (common peroneal nerve)

Answer 26

1) lateral sural cutaneous nerve

2) superficial fibular nerve

Question 27

fibula neck fracture

Answer 27

common fibular nerve (peroneal) most likely injured