The Lumbar Plexus - Gross Anatomy

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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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[@kannanraju8087]

Tracing of lumbar nerve is nice
Very understanding

[@MrSousaKing]

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Awesome explanation...sir being a medical student.....it was very useful to me....TQ sooo much for uploading

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[@doctorbhanuprakash]

Glad it was helpful!

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Incredible video! I have problems with almost all of those nerves but mostly genitafemoral nerve. 10 years of chronic scrotal pain

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Provide video on sacral plexus and their branches

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[@doctorbhanuprakash]

Tysm

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[@doctorbhanuprakash]

Tysm

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Crystal clear,however it will be more beneficial if you indicated the areas served by those nerves

[@doctorbhanuprakash]

Tysm

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