Posterior Abdominal Wall: Lumbar Plexus

Question 1

Iliohypogastric Nerve

Answer 1

L1
Motor to internal obliques + tranversus abdominis
Sensory to pubic region

Question 2

Ilioinguinal Nerve

Answer 2

L1
Motor to abdominal wall
Sensory to scrotum/labia + base of penis/clitoris
Superficial inguinal ring

Question 3

Genitofemoral Nerve

Answer 3

L1-L2
Within psoas major muscle
Genital branch to cremaster muscle
Femoral branch sensory to medial thigh

Question 4

Lateral Femoral Cutaneous Nerve

Answer 4

L2-L3
Lateral to iliacus muscle
Beneath inguinal ligament to sensation to lat thight

Question 5

Femoral Nerve

Answer 5

L2-L4
Major nerve to muscles of anterior thigh
Beneath inguinal ligament, lat to psoas major muscle

Question 6

Obturator Nerve

Answer 6

L2-L4
Major nerve to adductor muscles of medial thigh
obturator foramen (lat to psoas major muscle)