Lumbar plexus

Question 1

The lumbar plexus emerges from which muscle?

Answer 1

Emerges deep to Psoas major muscle.

Question 2

Formed by which anterior rami?

Answer 2

Anterior rami from L1-L4

Question 3

List the six main nerves that come from the Lumbar plexus and their anterior rami.

Answer 3

1. Iliohypogastric L1
2. Ilioinguinal L1
3. Genitofemoral L1-L2
4. Lateral femoral cutaneous l2-l3
5. Obturator L2-L4
6. Femora nerve L2-L4

Question 4

All the nerves except the two emerge lateral aspect of Psoas major. Name those 2 and their emerges.

Answer 4

Obturator- medial
Genitofemoral- anterior

Question 5

The Iliohypogastric nerve pieces which muscle as it runs anterior.

Answer 5

Transversus abdominis

Question 6

The lateral cutaneous branch of the iliohypogastric nerve pierces which muscle and innervates which part?

Answer 6

The lateral cutaneous branch makes its way on the abdominal muscle above iliac crest.
Innervates posterolateral gluteal region.

Question 7

The anterior cutaneous branch continues downward and ?

Answer 7

Medially

Question 8

The anterior cutaneous branch innervates.

Answer 8

Innervates abdominal muscles

Question 9

Which nerve runs inferior to the iliohpogastric

Answer 9

Ilioinguinal

Question 10

The ilioinguinal nerve Emerges which muscle and superficial to which muscles.
The ilioinguinal nerve emerges which ring along what?

Answer 10

Emerges lateral border of psoas major muscles. Superficial to quadratus lumborum
Emerges superficial inguinal ring along the spermatic cord.

Question 11

The ilioinguinal nerve innervates what?

Answer 11

Innervates skin on the pubic area

Question 12

The ilioinguinal nerve crosses which muscle to make way to iliac crest

Answer 12

Iliac muscle

Question 13

The ilioingunal peirces which muscles anteriorly

Answer 13

Transversus abdominis

Question 14

The genitofemoral nerve is divided into 2 branches, name those branches.

Answer 14

1. Genital branch
2. Femoral branch

Question 15

What does the genital branch innervates

Answer 15

The genital branch innervates the cremasteric muscles and scrotum in males.
In females innervates the mons pubis and labia majora skin.

Question 16

What does the femoral branch innervates?

Answer 16

Innervates the skin over the anterior thigh

Question 17

The lateral cutaneous nerve of the thigh runs oblique toward the ?

Answer 17

Anterior superior iliac spine

Question 18

The lateral cutaneous nerve of the thigh passes posterior to which ligaments?

Answer 18

Inguinal ligament

Question 19

The lateral cutaneous nerve innervates what?

Answer 19

Innervates the anterior to lateral surface of the thigh until the knee

Question 20

The obturator muscles descends through what to enter what?

Answer 20

Descends through pelvis to enter the thigh

Question 21

The obturator nerve enter nerve through which canal?

Answer 21

Obturator canal

Question 22

The obturator nerve innervates what?

Answer 22

Medial compartment of the thigh (Motor)
Skin over the medial thigh, knee and hip joint. (sensory)

Question 23

The femoral nerve descends through what to enter which ligaments?

Answer 23

Descends to pelvis to enter inguinal ligament

Question 24

The femoral nerve passes to which ligament ?

Answer 24

inguinal ligament

Question 25

Innervation of femoral nerve?

Answer 25

Innervates the anterior compartment of the thigh (Motor).
Anterior surface of the thigh and medial leg (Sensory)