The lumbosacral plexus

Question 1

What branch of the femoral nerve innervates the skin of the anterior thigh, medial aspect of the leg and foot?

Answer 1

saphenous nerve

Question 2

What colour is the deep peroneal nerve?

Answer 2

Green

Question 3

What muscles are supplied by the obturator nerve?

Answer 3

1. gracilis
2. adductor longus
3. adductor brevis
4. anterior portion of adductor magnus

Question 4

What muscles are innervated by the deep peroneal nerve?

Answer 4

All muscles in the anterior leg compartment

tibialis anterior

extensor digitorum longus

extensor halicus longus

Question 5

What muscles are innervated by the tibial nerve?

Answer 5

• Hamstrings
• muscles of the posterior leg
• sole of the foot by the plantar nerves

Question 6

True or false?

The sciatic nerve innervates everything below the knee apart from the skin on the medial leg

Answer 6

True

The skin on the median leg is innervated by the saphenous nerve

Question 7

What colour is the femoral nerve?

Answer 7

Yellow

Question 8

Which ventral rami make up the lumbar plexus?

Answer 8

L1-L5

Question 9

What nerves are supplied by the S1 nerve root? (5)

Answer 9

1. sciatic
2. tibial
3. common peroneal
4. superior gluteal
5. inferior gluteal

Question 10

What nerve roots does the obturator nerve have?

Answer 10

L2

L3

Question 11

What muscles are supplied by the sciatic nerve?

Answer 11

The hamstrings

and the posterior portion of adductor magnus

through the tibial component

Question 12

What nerves are supplied by the S2 nerve root? (4)

Answer 12

1. sciatic
2. tibial
3. common peroneal
4. inferior gluteal

Question 13

What colour is the tibial nerve?

Answer 13

Red - below the knee

Question 14

What parts of the skin is innervated by the tibial nerve?

Answer 14

The posterior leg

the sole of the foot by the sural nerve

Question 15

Which colour is the sciatic nerve?

Answer 15

red

Question 16

Which nerve innervates the skin of the medial thigh?

Answer 16

The obturator nerve

Question 17

What nerves are supplied by the L2 nerve root? (2)

Answer 17

1. femoral
2. obturator

Question 18

What muscles are supplied by the femoral nerve?

Answer 18

1. Quadriceps (rectus femoris, vastus medialis, vastus intermedius, vastus lateralis)
2. Sartorius
3. Pactineus

Question 19

What nerve roots does the inferior gluteal nerve have?

Answer 19

L5

S1

S2

Question 20

Where can the gluteal nerves be located?

Answer 20

the gluteal region

Question 21

What muscles are innervated by the superior gluteal nerves?

Answer 21

The abductors of the thigh ; gluteus medius and gluteus minimus

Question 22

What nerves are supplied by the L3 nerve root? (2)

Answer 22

1. Femoral
2. Obturator

Question 23

What colour is the superficial peroneal nerve?

Answer 23

purple

Question 24

What nerve innervates the skin on the lateral leg and dorsum of the foot?

Answer 24

superficial peroneal nerve

Question 25

What nerve roots does the tibial nerve have?

Answer 25

L4 L5 S1 S2 S3

Question 26

What is the sacral plexus made up of?

Answer 26

* The lumbosacral trunk (L4 & L5) * Ventral rami of S1-S3

Question 27

What 2 muscles are innervated by the superficial peroneal nerve?

Answer 27

* peroneus longus * peroneus brevis

Question 28

Which 2 nerves combine to make the sciatic nerve?

Answer 28

1. tibial nerve 2. common peroneal nerve

Question 29

Where is the obturator nerve located?

Answer 29

The medial compartment of the thigh

Question 30

True or false? The gluteal nerves don't innervate the skin at all

Answer 30

True

Question 31

What skin is innervated by the deep peroneal nerve?

Answer 31

the 1^st webspace

Question 32

Which 2 branches of the tibial nerve innervate the: 1) muscles in the sole of the foot 2) the skin in the sole of the foot

Answer 32

1. the plantar nerves 2. the sural nerve

Question 33

What does the lumbosacral plexus consist of?

Answer 33

The lumbar plexus the sacral plexus

Question 34

What nerve roots does the common peroneal nerve have?

Answer 34

L4 L5 S1 S2

Question 35

What nerves are supplied by the S3 nerve root? (2)

Answer 35

1. sciatic 2. tibial

Question 36

What colour is the obturator nerve?

Answer 36

Blue

Question 37

Where is the femoral nerve located?

Answer 37

In the anterior compartment of the thigh

Question 38

Where can you locate the deep peroneal nerve?

Answer 38

The anterior nerve

Question 39

What nerve roots does the sciatic nerve have?

Answer 39

L4 L5 S1 S2 S3

Question 40

What is a plexus and why do we have it?

Answer 40

1. a network of nerves derived from nerve roots 2. allows multiple nerve roots to enter a single peripheral nerve

Question 41

What colour is the deep peroneal nerve?

Answer 41

Green

Question 42

What muscle does the inferior gluteal nerve innervate?

Answer 42

gluteus maximus

Question 43

What nerves are supplied by the L5 nerve root? (5)

Answer 43

1. sciatic 2. tibial 3. common peroneal 4. superior gluteal 5. inferior gluteal

Question 44

What nerve roots does the superior gluteal nerve have?

Answer 44

L4 L5 S1

Question 45

What nerve roots does the femoral nerve have?

Answer 45

L2 L3 L4

Question 46

What colour is the femoral nerve?

Answer 46

Yellow

Question 47

Where can you locate the superficial peroneal nerve?

Answer 47

the lateral leg

Question 48

What nerves are supplied by the L4 nerve root? (5)

Answer 48

1. femoral 2. sciatic 3. tibial 4. common peroneal 5. superior gluteal

Question 49

What is a nerve root?

Answer 49

* The vertebral level whereby a nerve branches off from the spinal cord * nerve roots connect peripheral nervous system to central nervous system * brain uses vertebral level to map out areas of the body