Which tissue surrounds the axons within a nerve?

Which tissue surrounds the axons within a nerve?

• A. Endoneurium
• B. Epineurium
• C. Perineurium
• D. Myelin sheath

Answer: (A)

The tissue that surrounds each individual axon within a peripheral nerve is the endoneurium. This delicate connective tissue layer encloses every axon (and its myelin sheath, if present) and contains capillaries and fibroblasts to support the fiber and maintain its environment. Surrounding groups of axons is the perineurium, which forms a barrier around fascicles, and the whole nerve is wrapped by the epineurium. The myelin sheath itself is the insulating layer produced by Schwann cells around the axon, not the wrapping tissue around the axon as a separate protective layer.

The tissue that surrounds each individual axon within a peripheral nerve is the endoneurium. This delicate connective tissue layer encloses every axon (and its myelin sheath, if present) and contains capillaries and fibroblasts to support the fiber and maintain its environment. Surrounding groups of axons is the perineurium, which forms a barrier around fascicles, and the whole nerve is wrapped by the epineurium. The myelin sheath itself is the insulating layer produced by Schwann cells around the axon, not the wrapping tissue around the axon as a separate protective layer.