In a cross-section of a peripheral nerve, what term describes a bundle of nerve fibers?

In a cross-section of a peripheral nerve, what term describes a bundle of nerve fibers?

• A. Nerve fascicle
• B. Epimysium
• C. Endomysium
• D. Perimysium

Answer: (A)

In a peripheral nerve, a bundle of nerve fibers is called a fascicle. Each fascicle is wrapped by the perineurium, and several fascicles together make up the whole nerve, which is surrounded by the epineurium. Inside a fascicle, the individual nerve fibers are enclosed by the endoneurium. The other terms describe connective tissue around muscle rather than around nerve fibers: epimysium surrounds the whole muscle, endomysium wraps each muscle fiber, and perimysium bundles muscle fibers (not nerve fibers). So the term for a bundle of nerve fibers in a cross-section is a fascicle.

In a peripheral nerve, a bundle of nerve fibers is called a fascicle. Each fascicle is wrapped by the perineurium, and several fascicles together make up the whole nerve, which is surrounded by the epineurium. Inside a fascicle, the individual nerve fibers are enclosed by the endoneurium. The other terms describe connective tissue around muscle rather than around nerve fibers: epimysium surrounds the whole muscle, endomysium wraps each muscle fiber, and perimysium bundles muscle fibers (not nerve fibers). So the term for a bundle of nerve fibers in a cross-section is a fascicle.