Nerves- Sacral Plexus

Question 1

sacral plexus roots

Answer 1

S1-S5

Question 2

nerves of sacral plexus

Answer 2

-lumbosacral trunk
-superior gluteal nerve
-inferior gluteal nerve
-posterior femoral cutaneous nerve
-pudendal
-sciatic nerve (common peroneal/fibular nerve + tibial nerve)

Question 3

lumbosacral trunk comes from

Answer 3

lumbar plexus

Question 4

what does pudendal innervate

Answer 4

pelvic floor muscles

Question 5

sciatic nerve branches

Answer 5

sciatic nerve is formed by 2 independent nerves:
-common peroneal/fibular nerve
-tibial nerve

Question 6

common peroneal nerve is also called

Answer 6

common fibular nerve

Question 7

motor branches of sacral plexus

need to know

Answer 7

-nerve to piriformis
-nerve to quadratus femoris/inferior gemelli
-nerve to superior gemelli/obturator internus

Question 8

superior gluteal nerve roots

Answer 8

L4-S1

Question 9

inferior gluteal nerve roots

Answer 9

L5-S2

Question 10

posterior femoral cutaneous nerve roots

Answer 10

S1-3

Question 11

pudendal roots

Answer 11

S2-4

Question 12

sciatic nerve roots

Answer 12

L4-S3

Question 13

common peroneal/fibular nerve roots

Answer 13

L4-S2

Question 14

tibial nerve roots

Answer 14

L4-S3

Question 15

what nerves of sacral plexus come from posterior division

Answer 15

-superior gluteal nerve
-inferior gluteal nerve
-common peroneal/fibular nerve
-nerve to piriformis

Question 16

what nerves of sacral plexus come from anterior division

Answer 16

-pudendal
-tibial nerve
-nerve to quadratus femoris/inferior gemelli
-nerve to superior gemelli/obturator internus

Question 17

what nerves of sacral plexus come from both anterior + posterior divisions

Answer 17

-posterior femoral cutaneous nerve
-sciatic nerve (common fibular comes from posterior + tibial comes from anterior)