Which nerve runs between the bones of the lower leg?

• A. Sural nerve
• B. Crural interosseous nerve
• C. Deep peroneal nerve
• D. Tibial nerve

Answer: (B)

The leg has an interosseous space between the tibia and fibula formed by the crural interosseous membrane, and the nerve that travels right through that space is the crural interosseous nerve. This nerve literally runs between the two leg bones within that interosseous area, which is why it’s described as the interosseous nerve of the leg. The other nerves follow different paths: the sural nerve stays in the posterior aspect of the leg and toward the foot, the deep peroneal nerve travels down the front of the leg in the anterior compartment, and the tibial nerve runs in the deep posterior compartment behind the tibia. Thus, the one that runs between the bones of the lower leg is the crural interosseous nerve.