Lumbrosacral plexus

Question 1

Where does the lumbar plexus form?

Answer 1

psoas major muscle

Question 2

What does lumbar plexus primarily innervate?

Answer 2

posterior abdominal wall

anterior thigh muscle

medial thigh

Question 3

Where does iliohypogastric branch off? to where?

Answer 3

L1

gluteal & lower abdomen

Question 4

Where does ilio-inguinal branch off? to where?

Answer 4

L1

inguinal region (proximal medial thigh) & lower abdomen

Question 5

Where does lateral femoral cutaneous nerve branch off? To where?

Answer 5

L2, L3

proximal anterolat. thigh as far as knee

Question 6

Where does femoral nerve branch off? To where?

Answer 6

L2, L3, L4

anterior compartment of thigh

pectineus

hip, knee and joints

Question 7

Where does obturator branch off?

Answer 7

L2 L3 L4

Question 8

Where does genito-femoral branch off? to where?

Answer 8

L1, L2

genital region & proximal anterior thigh

cremaster muscle

Question 9

What branch off from anterior border?

Answer 9

genio-femoral

Question 10

What is the strange muscle that acts as a medial abductor and innervated by femoral nerve?

Answer 10

pectineus

Question 11

What are two cutaneous nerves that femoral branches off?

Answer 11

anterior femoral cutaneous nerve

saphrenous nerve

Question 12

What are nerves that branch off lateral border of psoas?

Answer 12

subcostal

iliohypogastric

ilio-inguinal

femoral

lateral femoral cutaneous

Question 13

What nerve branch off anterior border of psoas?

Answer 13

genitofemoral nerve

Question 14

What branch off medial border of psoas major?

Answer 14

obturator

Question 15

What does obturator nerve innervate?

Answer 15

adductor muscle (except pectineus)

obturator externus

skin on medial thigh

Question 16

Is subcostal nerve part of lumbar plexus?

Answer 16

no because it branch off from diaphragm

Question 17

Where does lumbosacral trunk branch off? What does it contribute to?

Answer 17

L4-5

sacral plexus

Question 18

Where are the sacral plexus from?

Answer 18

L4-5 and S1-4

Question 19

What does sacral plexus innervate?

Answer 19

posterior thigh

buttock

all of leg and foot below knee except medial cutaneous leg

Question 20

What scral plexus come off from L4-5, S1?

Answer 20

superior gluteal

quadratus femoris (& inferior gemellus)

Question 21

What scacral plexus come off from L5, S1-2?

Answer 21

inf gluteal

obturator internus (&sup gemellus)

Question 21

What sacral plexus come off from S1-2?

Answer 21

piriformis

Question 22

what scacral plexus come off from S1-3?

Answer 22

post femoral cutaneous

Question 23

What scacral plexus come off from S2-4?

Answer 23

pudendal

Question 24

What are the largest cutaneous nerve innervation in body?

Answer 24

posterior femoral cutaneous (S1-S3)

Question 25

Where does sciatic nerve branch from?

Answer 25

L4-5, S1-3

Question 26

What does sciatic nerve consist of?

Answer 26

common peroneal & tibial in common sheath

Question 27

What does tibial nerve innervate?

Answer 27

posterior thigh muscle (hamstring except short head biceps & post comp adductus magnus) all post leg muscles popliteal fossa branches medial & lateral plantar

Question 28

What does common peroneal n innervate?

Answer 28

short head biceps femoris in thigh popliteal fossa (lateral sural nerve & superficial fibular) superficial/deep peroneal

Question 29

What does superficial peroneal innervate? deep peroneal?

Answer 29

lateral leg muscle anterior leg muscle

Question 30

What does sural nerve innervate?

Answer 30

posterolateral leg muscle

Question 31

1-5?

Answer 31

1 - iliohypogastric 2- subcostal nerve 3- Genitofemoral 4- ilioinguinal 5 - dorsal rami (L1,2,3)

Question 32

6-11

Answer 32

Dorsal rami (s1,2,3) lateral femoral cutaneous posterior femoral cutaneous obturator anterior femoral cut lateral sural cutaneous n