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Fiber composition of the rat sciatic nerve

The rat sciatic nerve originates from the spinal segments L4–L6. It is unifascicular at the trochanter; 5–7 mm distally, the nerve splits into two and then into four fascicles. The tibial portion gives rise to the tibial and the sural nerves, and the peroneal portion gives rise to the peroneal nerve and a cutaneous branch that perforates the lateral hamstring muscles to innervate the proximolateral face of the calf.