- Anatomy:
- primary ventral rami of five lumbar nerves and of first four sacral nerves combine to form the lumbar (
L1,
L2,
L3,
L4) &
lumbosacral (
L4,
L5,
S1,
S2,
S3, S4) plexuses, each giving rise to anterior and posterior branches;
- anterior branches supply flexor muscles of limb, while posterior branches
supply extensor and abductor muscles;
- largest of these derivatives are
femoral &
obturator nerve;
- cutaneous branches include:
-
lioinguinal (
L1),
genitofemoral nerve
(
L1,
L2),
iliohypogastric, nerve nerve (
L1)
&
lateral cutaneous nerve of thigh (
L2,
L3) supplying lateral & anterolateral thigh;
