Lab 5

Question 1

Where does the lumbosacral trunk come from?

Answer 1

L4-L5

Question 2

What does the lumbosacral trunk connect?

Answer 2

Lumbar plexus with the sacral plexus

-It descend the pelvis to join the 1st sacral nerve

Question 3

Where does the Lateral cutaneous nerve of the thigh (Lateral femoral cutaneous nerve) come from?

Answer 3

L2-L3 (Lumbar plexus)

Question 4

What does the lateral femoral cutaneous nerve innervate?

Answer 4

Skin over lateral and anterior thigh and lateral part of the thigh

Question 5

Where does the Obturator nerve come from?

Answer 5

L2, L3, L4

Question 6

Where does the Accessory Obturator come from?

Answer 6

L3, L4

Question 7

Where does the Femoral nerve come from?

Answer 7

L2, L3, L4

Question 8

Where does the genitofemoral nerve come from?

Answer 8

L1, L2

Question 9

Where does the iliohypogastric nerve come from?

Answer 9

L1

Question 10

Where does the ilioinguinal nerve come from?

Answer 10

L1

Question 11

What does the ilioinguinal nerve innervate?

Answer 11

• Skin and upper medial part of thigh
• Skin over the root of the penis and upper part of the scrotum (male)
• Skin covering mons pubis and labium majus (female)

Question 12

Where does the ilioinguinal nerve run?

Answer 12

Above spermatic fascia/spermatic cord (NOT within cord)

Question 13

Where does the genital branch of the genito-femoral nerve run?

Answer 13

Within the spermatic cord/fascia.

It runs alongside the Ductus (vas) deferens

Question 14

What does the iliohypogastric nerve innervate?

Answer 14

• Skin over lateral gluteal region and above pubis

- Internal and transverse abdominal muscles

Question 15

Where does the subcostal nerve run? Where does it originate?

Answer 15

Runs along the lower boarder of 12th rib.

T12

Question 16

What does the subcostal nerve innervate?

Answer 16

Sensory innervation to the skin over the hip

Question 17

Where does the femoral branch of the genitofemoral nerve pass? What does it supply?

Answer 17

It passes beneath the inguinal ligament within the femoral sheath.
Supplies: skin over the femoral triangle

Question 18

Where does the genital branch of the genitofemoral nerve pass? What does it supply?

Answer 18

Runs to the deep inguinal ring and traverses inguinal canal to supply the cremaster muscle

Question 19

What is the cremasteric reflex?

Answer 19

Elevates testicles in response to light stroking of the inner thigh or cold temperatures applied to the scrotum. The sensory limb is carried in the femoral branch; the motor limb is carried in the genital branch.

Question 20

What does the Obturator nerve innervate?

Answer 20

Medial compartment of the thigh

Question 21

What does the femoral nerve innervate?

Answer 21

Anterior compartment of the thigh. Supplies skin of upper thigh and inner leg. Supplies muscles that extend the knee.