Which of the following best represents the sensory nerve fiber types mentioned?

Which of the following best represents the sensory nerve fiber types mentioned?

• A. A-alpha, A-beta, A-gamma
• B. A-delta, C-fiber
• C. A-alpha, A-beta, A-delta
• D. A-beta, A-gamma, C-fiber

Answer: (A)

Understanding how nerve fibers are labeled helps explain why this option fits best. Nerve fibers are grouped by diameter and myelination into A, B, and C classes. A fibers are myelinated and fast, and within that group you see A-alpha, A-beta, A-delta, and A-gamma. The choice that lists three A-type subtypes—A-alpha, A-beta, A-gamma—is the best match because it stays within the fast, myelinated A-family. The other options mix in C fibers (unmyelinated and slower) or omit an A-type, making them less representative of the fiber types described.

Understanding how nerve fibers are labeled helps explain why this option fits best. Nerve fibers are grouped by diameter and myelination into A, B, and C classes. A fibers are myelinated and fast, and within that group you see A-alpha, A-beta, A-delta, and A-gamma. The choice that lists three A-type subtypes—A-alpha, A-beta, A-gamma—is the best match because it stays within the fast, myelinated A-family. The other options mix in C fibers (unmyelinated and slower) or omit an A-type, making them less representative of the fiber types described.