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Lumbar plexus

Other Terms: Lumbar plexus, Plexus lumbalis, Plexus lombal

Description

The lumbar nerve plexus is formed by the intercommunication of the anterior divisions of the upper four lumbar nerves and a communicating branch from the anterior division of the last thoracic nerve, the dorsi lumbar nerve. The lumbar and sacral plexuses are often discussed together as the lumbosacral plexus. The lumbar plexus is placed in front of the transverse processes of the lumbar vertebrae, within the substance of the psoas major muscle. A branch from the fourth lumbar and the fifth lumbar nerves form the lumbosacral trunk, which connects with the sacral plexus. The branches of the lumbar plexus are: the iliohypogastric nerve, the ilioinguinal nerve, the genitofemoral nerve, the lateral femoral cutaneous nerve, the femoral nerve, the obturator nerve, and the accessory nerve. The accessory nerve is only in about 10% of people. The ilioinguinal nerves are derived from the first lumbar nerve and a branch from the twelfth thoracic nerve. The genitofemoral nerve is derived from the first and second lumbar nerves. The lateral femoral nerve cutaneous nerve is derived from the second and third lumbar nerves. The obturator and femoral nerves are derived from the second, third, and fourth lumbar nerves. The accessory nerve is derived from the third or fourth lumbar nerves.

Branches

Ilioinguinal nerve
Iliohypogastric nerve
Genitofemoral nerve
Lateral femoral cutaneous nerve
Femoral nerve
Obturator nerve
Nerve to quadratus lumborum
Nerve to psoas minor
Nerve to psoas major

Latin

Plexus lumbalis

French

Plexus lombal

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