Final answer:
The common fibular and tibial nerves have similar roots arising from the sacral plexus in the leg.
Step-by-step explanation:
The common fibular nerve and the tibial nerve are two major branches of the sciatic nerve in the leg. They have similar roots as they both arise from the sacral plexus, a network of nerves associated with the lower lumbar and sacral spinal nerves.
The common fibular nerve originates from the dorsal branches of the fourth and fifth lumbar nerves and the first and second sacral nerves, while the tibial nerve arises from the dorsal branches of the fifth lumbar nerve and the first and second sacral nerves.