Unit 3 - Thorax, Abdomen, Pelvis, and Perineum: Lumbar Plexus (Ex. III)

Question 1

pre-terminal branches

Answer 1

genitofemoral n. (L1-L2) on top of psoas major
- genital and femoral cutaneous branches
- genital branch –> cremaster runs through spermatic cord
obturator n. (L2-L4) deep to M psoas major
- cutaneous branch
- adductor magnus (from P branch)
- obturator externus (direct)
- adductor longus; adductor brevis; gracilis; pectineus (from A branch)

Question 2

terminal branches

Answer 2

subcostal n. (T12) under rib 12
iliohypogastric n. (T12-L1)
- A and L cutaneous branches
- transversus abdominis; I internal oblique
ilioinguinal n. (L1)
- A scrotal/labial nn.
- transversus abdominis; I internal oblique
L femoral cutaneous n. (L2-L3) on iliacus I to iliac crest
femoral n. (L2-L4) deep to L psoas major
- iliopsoas; pectineus; sartorius; quadriceps femoris
- A cutaneous branch; saphenous branch
lumbosacral trunk (L4-L5)
- gives rise to pudendal n.

Question 3

short, direct branches from T12-L4

Answer 3

psoas major
quadratus lumborum
iliacus
intertransversarii lumborum

Question 4

sexually

Answer 4

subcostal n. (T12)

Question 5

interested

Answer 5

iliohypogastric n. (T12-L1)

Question 6

individuals

Answer 6

ilioinguinal n. (L1)

Question 7

love

Answer 7

L femoral cutaneous n. (L2-L3)

Question 8

flexible

Answer 8

femoral n. (L2-L4)

Question 9

ladies

Answer 9

lumbosacral trunk (L4-L5)

Question 10

roots

Answer 10

T12-L5

Question 11

go

Answer 11

genitofemoral n. (L1-L2)

obturator n. (L2-L4)