Lumbosacral Plexus

The lumbosacral plexus is formed by the anterior rami of spinal nerves T12 through S4 (Figure III-5-1). The innervation of the lower limb arises from segments L2 through S3. The major nerves of the lower limb are die:

• Femoral nerve—posterior divisions of L2 through L4

• Obturator nerve—anterior divisions of L2 through L4

■ Tibial nerve—anterior divisions of L4 through S3

■ Common peroneal nerve—posterior divisions of L4 through S2

The tibial nerve and common peroneal nerve travel together through the gluteal region and thigh in a common connective tissue sheath and together are called the sciatic nerve.

The common peroneal nerve divides in the proximal leg into the superficial and deep peroneal nerves.

Sciatic nerve —

Tibial ne

Inti . giu

Commc perone;

Sciatic nerve —

Tibial ne

Figure lil-5-1. Lumbosacral Plexus

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