Nerves

Question 1

What is the first nerve that comes from the lumbar plexus?

Answer 1

Iliohypogastric (L1)

Question 2

What nerve roots is the lumbar plexus?

Answer 2

L1-L5

Question 3

What does the iliohypogastric nerve supply?

Answer 3

Abdominal muscles and skin of inguinal/pubic regions

Question 4

Nerve roots of ilioinguinal? Distribution?

Answer 4

L1, supplies skin of penis and scrotum/ mons pubis and labia majora

Question 5

Describe the route of iliohypogastric nerve

Answer 5

L1-> crosses quadratus lumborum-> pierces transversus abdominis

Question 6

Describe route of ilioinguinal nerve

Answer 6

L1-> crosses quadratus lumborum-> goes through superficial inguinal ring

Question 7

Describe genitofemoral nerve

Answer 7

L1-2, supplies skin over femoral triangle and genital branch supplies cremaster muscle, scrotum/ mons pubis, labia majora

Question 8

Which nerve has roots of L2-3?

Answer 8

Lateral femoral cutaneous nerve of the thigh

Question 9

Describe route of lat fem n. of thigh

Answer 9

Travels accross iliacus and enters thigh under inguinal ligament

Question 10

What nerves have roots L2-L4?

Answer 10

Femoral and Obturator

Question 11

Femoral n. supplies:

Answer 11

Flexors of the hip and knee

Question 12

Obturator nerve supplies:

Answer 12

Adductors of the thigh

Question 13

What nerve is L4-5?

Answer 13

Lumbosacral trunk-> sacral plexus

Question 14

What nerve root values is the sacral plexus?

Answer 14

L4-S4 (with help of lumbosacral trunk)

Question 15

Where is the sacral plexus found?

Answer 15

In fascia that covers anterior surface of piriformis

Question 16

What muscles are supplied by the sacral plexus directly?

Answer 16

Obturator internus, piriformis, levator ani

Question 17

Name the main nerves from the sacral plexus that leave via the greater sciatic foramen

Answer 17

Sciatic nerve and pudendal nerve