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21 The nerves of the abdomen
T12 (subcostal)
L1
Nerves
L2
Subcostal
Iliohypogastric
L3
Ilioinguinal
L4
Genitofemoral
Lateral L5
cutaneous
of thigh
Femoral
Obturator
Fig.21.1
The lumbar plexus Lumbosacral trunk
Medial arcuate Coeliac ganglia
ligament
Suprarenal branch
Grey and white rami
(white rami on first Cut psoas major
two lumbar nerves only) Sympathetic trunk
Lumbar sympathetic ganglia
(usually 4)
Grey rami
Superior hypogastric plexus
(presacral nerves)
Inferior hypogastric plexus
Pelvic sympathetic ganglia
Grey rami
Fig.21.2
The sympathetic system in the abdomen and pelvis
50 Abdomen and pelvis
