Lumbosacral Plexus Course

Question 1

courses along inferior border of 12th rib

in same manner as intercostal nerves

Answer 1

Subcostal nerve

Question 2

parallels iliac crest to reach inguinal and pubic regions

Answer 2

Iliohypogastric nerve

Question 3

passes through inguinal canal and divides into femoral and scrotal or labial branches

Answer 3

Ilio-inguinal nerve

Question 4

descends on anterior surface of psoas major and divides into genital and femoral branches

Answer 4

Genitoformal nerve

Question 5

passes deep to inguinal ligament, 2-3 cm medial to anterior superior iliac spine

Answer 5

Lateral femoral cutaneous nerve

Question 6

passes deep to midpoint of inguinal ligament, lateral to femoral vessels, and divides into muscular and cutaneous branches

Answer 6

Femoral nerve

Question 7

enters the thigh through the oburator foramen and divides

• its anterior branch descends between adductor longus and adductor brevis
• its posterior branch descends between adductor brevis and adductor magnus.

Answer 7

Obturator nerve