Lumbar Plexus

Question 1

The lumbar plexus stretches from ___ to ___

Answer 1

L1-L4

Question 2

How many different nerves make up the lumbar plexus?

Answer 2

7

Question 3

L1 contains?

Answer 3

3 nerves - Iliohypogastric nerve, Ilio-inguinal nerve, and genitofemoral nerve.

Question 4

L2 contains?

Answer 4

4 nerves - Genitofemoral nerve, lateral cutaneous nerve of thigh, Femoral Nerve, and Obturator nerve

Question 5

L3 contains?

Answer 5

3 nerves - Lateral cutaneous nerve of thigh, femoral nerve, and obturator nerve

Question 6

L4 contains?

Answer 6

3 nerves - Femoral nerve, obturator nerve, and lumbosacral trunk

Question 7

L5 contains?

Answer 7

Lumbosacral trunk

Question 8

Where is the Iliohypogastric nerve located?

Answer 8

L1

Question 9

Where is the Ilio-inguinal nerve located?

Answer 9

L1

Question 10

Where is the Genitofemoral nerve located?

Answer 10

L1 and L2

Question 11

Where is the lateral cutaneous nerve of thigh located?

Answer 11

L2 and L3

Question 12

Where is the femoral nerve located?

Answer 12

L2-L4

Question 13

Where is the Obturator nerve located?

Answer 13

L2-L4

Question 14

Where is the lumbosacral trunk located?

Answer 14

L4 and L5 *Note the lumbosacral trunk extends into L5 whereas the lumbar plexus only extends to L4. Therefore the lumbosacral trunk is a part of the lumbar and sacral plexus.

Question 15

Lumbar plexus mnemonic

Answer 15

“I, I Get Laid On Fridays”: Iliohypogastric [L1] Ilio-inguinal [L1] Genitofemoral [L1, L2] Lateral femoral cutaneous [L2, L3] Obtruator [L2, L3, L4] Femoral [L2, L3, L4]

Question 16

Lumbar plexus roots “2 from 1, 2 from 2, 2 from 3”

Answer 16

2 nerves from 1 root: Ilioinguinal (L1), Iliohypogastric (L1). 2 nerves from 2 roots: Genitofemoral (L1,L2), Lateral Femoral (L2,L3). 2 nerves from 3 roots: Obturator (L2,L3,L4), Femoral (L2,L3,L4).

Question 17

Lumbar Plexus

Answer 17