Lumbar nerve plexus

Question 1

Iliohypogastric nerve

-supply

Answer 1

APR L1 (T12)

• lat to psoas maj (after passing thru it)
• runs along iliac crest (passes thru TA and IO)
• supply groin area/abdominal

Question 2

Ilioinguinal nerve

• supply
• path

Answer 2

APR L1 (t12)

• Lat to psoas maj (after passing thru it)
• Runs w Iliohypogastric, passes superficially thru inguinal ring
• supply skin over pubic symphosis, ant part of genetalia

Question 3

Genetiofemoral nerve

• supply
• path

Answer 3

APR L1, L2

• Passes all the way thru psoas to ant side
• Genital branch passes thru deep inguinal ring as component of spermatic cord (Cremaster reflex)
• Femoral innervates skin of upper thigh

Question 4

Lat cutaneous nerve of thigh

• supply
• path

Answer 4

(APR L2,L3)

• emerges on lat portion of psoas
• passes under asis
• innervates lat thigh

Question 5

Femoral nerve

• suppy
• path

Answer 5

APR L2,3,4

• lateral side of psoas
• enters thigh deep to inguina lig

Question 6

Obturator nerve

• supply
• path

Answer 6

APR L2,3,4

• deep and medial to psoas maj
• enters lesser pelvis and exits obturator canal

Question 7

Accessory nerve

• supply
• path

Answer 7

APR L3,4

• travels close to obturator nerve
• post division

Question 8

lumbar veins drain into the

Answer 8

inf vena cava