Appendix B: Muscles and nerves of lower extremity

Question 1

dermatome L1

Answer 1

anterior thigh just below inguinal lig

Question 2

motor L1

Answer 2

hip flexors

Question 3

dermatome L2

Answer 3

middle and anterior thigh

Question 4

motor L2

Answer 4

hip flexors and ADductors

Question 5

dermatome L3

Answer 5

anterior thigh just above knee

Question 6

motor L3

Answer 6

knee extensors

Question 7

dermatome L4

Answer 7

medial malleolus

Question 8

motor L4

Answer 8

ankle dorsiflexors

patellar reflex

Question 9

dermatome L5

Answer 9

dorsal aspect foot and big toe

Question 10

motor L5

Answer 10

toe extensors

Question 11

S1 dermatome

Answer 11

lateral malleolus

Question 12

S1 motor

Answer 12

ankle plantar flexors

achilles reflex

Question 13

inn and action iliopsoas

Answer 13

femoral N L1!! L2!! L3

flex hip

Question 14

inn and action of sartorius

Answer 14

femoral N L2, L3

flex ABduct and externally rotate thigh

Question 15

inn and action rectus femoris

Answer 15

femoral n L2, L3!! L4!!

flex hip and extend knee

Question 16

inn and action vastus medialis

Answer 16

femoral n L2 L3!! L4!!

extend knee

Question 17

inn and action vastus lateralis

Answer 17

femoral n L2 L3!! L4!!

extend knee

Question 18

inn and action vastus intermedius

Answer 18

femoral n L2 L3!! L4!!

extend knee

Question 19

What mm are inn by obturator n

Answer 19

ADductor longus L3
ADductor brevis L3
Adductor magnusL3/L4 (part of magnus)
gracilis L2 –protectis virginalis because ADduct and flex

Question 20

what mm are inn by sciatic nerve

Answer 20

ADductor magnus, other part
semitendinosus- tibial part L5 S1
semimembranosus- tibial part L5 S1
biceps femoris (long head tibial, short head peroneal)

Question 21

what is innervated by superior gluteal n L5 S1

Answer 21

gluteus medius– ABduct hip

TFL– flex and ABduct

Question 22

what is inn by inferior gluteal n S1 S2

Answer 22

gluteus maximus– extend hip!!!!!!!!

Question 23

piriformis innervation

Answer 23

sacral nerve S1 S2

externally rotate leg

Question 24

deep peroneal nerve innervates what mm

Answer 24

tibialis anterior– dorsiflex and invert
extensor halllucis longuse– extend big toe, dorsiflex foot
extensor digitorum longus– extends digits
peroneus tertius– dorsiflex and evert foot
extensor digitorum brevis
extensor hallucis brevis

Question 25

superficial peroneal innervates what mm

Answer 25

peroneus longus– evert and plantar flex

peroneus brevis– evert and plantar flex

Question 26

what is innervated by tibial nerve

Answer 26

gastroc-- plantar flex &! flex knee
soleus-- soley plantar flex foot!
plantaris
popliteus
flexor hallucis longus
flexor digitorum longus
tibialis posterior-- plantar flex and invert!!!

Question 27

where does perosneus longus insert

Answer 27

base 1st metatarsal and medial cuneiform

wraps under foot from lateral side so helps with eversion and plantar flexion