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Lumbar plexus
The lumbar plexus is a complex neural network formed by the lower thoracic and lumbar ventral nerve roots (T12 to L5) which supplies motor and sensory innervation to the lower limb and pelvic girdle.
origin: ventral rami of T12 to L5
course: formed within the substance of the psoas major muscle, anterior to the lumbar transverse processes
major (terminal) branches
Iliohypogastric nerve
ilioinguinal nerve
genitofemoral nerve
lateral femoral cutaneous nerve
femoral nerve
obturator nerve
motor supply: lower limb and pelvic girdle
sensory supply: lower anterior abdominal wall, groin, upper thigh and pudenda
Gross anatomy
The branches that arise from the lumbar plexus are:
subcostal nerve: T12
Iliohypogastric nerve: L1
ilioinguinal nerve: L1
genitofemoral nerve: L1, 2
lateral femoral cutaneous nerve: L2, 3
femoral nerve: L2, 3, 4
obturator nerve: L2, 3, 4
lumbosacral trunk: L4, 5
this contributes to the sacral plexus
The branches of the lumber plexus are covered in this mnemonic.
Variant anatomy
Variation in the lumbar plexus appears to be common (~90% in one study) 1:
absent iliohypogastric nerve (~20%)
early branching (within psoas muscle) of the genitofemoral nerve (~20%)
accessory obturator nerve (~10%)
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