Innervation of Lower Limb

Question 1

What innervates the superficial gluteal muscles?

Answer 1

Gluteal nerve

Question 2

What is iliacus innervated by?

Answer 2

femoral nerve

Question 3

What are all medial thigh muscles innervated by?

Answer 3

Obturator nerve

Question 4

What are the roots of the lumbar plexus?

Answer 4

L2-L5

S1-S3

Question 5

What are the nerves the the lumbar plexus gives rise to?

Answer 5

iliohypogastric
ilioinguinal
genitofemoral
lateral femoral cutaneus
obturator 
femoral

Question 6

What is the mnemonic?

Answer 6

I (twice) get laid on fridays

Question 7

Where does the lumbar plexus form?

Answer 7

Inside psoas major

Question 8

What spinal nerves form the basis of the lumbar plexus?

Answer 8

L1-L4

Question 9

How many major peripheral nerves of the lumbar plexus are there?

Answer 9

6

Question 10

What does the genitofemoral nerve divide into and where?

Answer 10

after leaving psoas major in genital and femoral

Question 11

What nerve in the lumbar plexus has no motor functions

Answer 11

lateral cutaneous nerve of the thigh

Question 12

What spinal nerves form the basis of the sacral plexus?

Answer 12

S1-S4

Question 13

How many major peripheral nerves are there of the sacral plexus?

Answer 13

5

Question 14

What nerves form the five major branches of the sacral plexus?

Answer 14

superior gluteal, inferior gluteal, sciatic, posterior femoral cutaneous, pudendal

Question 15

Motor functions of femoral nerve

Answer 15

flex hip (pectineus, iliacus, sartorius), extend the knee (quads)

Question 16

Motor functions of obturator nerve

Answer 16

all muscles in medial thigh, execpt hamstring and part of adductor magnus, which are innervated by tibial nerve

Question 17

Motor functions of sciatic nerve

Answer 17

posterior thigh and hamstring portion of adductor magnus

Question 18

Motor functions of tibial nerve

Answer 18

posterior leg