In nervous tissue, what connective tissue sheath wraps around an individual axon of a neuron (particularly in the peripheral nervous system)?

• A. Perineurium
• B. Dura mater
• C. Epineurium
• D. Endoneurium

Answer: (D)

Verified step by step guidance

1. Understand that in the peripheral nervous system, axons of neurons are organized and protected by different layers of connective tissue sheaths.
2. Identify the three main connective tissue sheaths associated with peripheral nerves: epineurium, perineurium, and endoneurium.
3. Recall that the epineurium is the outermost layer that surrounds the entire nerve, which is a bundle of many fascicles (groups of axons).
4. Recognize that the perineurium is the middle layer that wraps around each fascicle, providing a protective barrier around a bundle of axons.
5. Know that the endoneurium is the innermost connective tissue sheath that wraps around each individual axon, providing insulation and support at the single-axon level.