Which nerve fiber types are found throughout the oral cavity?

Which nerve fiber types are found throughout the oral cavity?

• A. A & B
• B. B & C
• C. A & C
• D. Only A

Answer: (C)

Two nerve fiber types carry sensory input throughout the oral cavity: A-type fibers and C-type fibers. A-type fibers are large and myelinated, conducting signals quickly, and include A-delta fibers that transmit fast, sharp pain and temperature—helping localize a stimulus like a sharp dental pulp or mucosal touch. C-type fibers are small and unmyelinated, conduct slowly, and produce dull, aching, longer-lasting pain that’s harder to localize, contributing to inflammatory or persistent pain in the oral tissues. The other fibers (B-type) are autonomic preganglionic fibers involved mainly in regulating blood flow and glands, not in carrying the primary sensory signals across the mouth. Therefore, the sensory innervation throughout the oral cavity relies on A-type and C-type fibers.

Two nerve fiber types carry sensory input throughout the oral cavity: A-type fibers and C-type fibers. A-type fibers are large and myelinated, conducting signals quickly, and include A-delta fibers that transmit fast, sharp pain and temperature—helping localize a stimulus like a sharp dental pulp or mucosal touch. C-type fibers are small and unmyelinated, conduct slowly, and produce dull, aching, longer-lasting pain that’s harder to localize, contributing to inflammatory or persistent pain in the oral tissues. The other fibers (B-type) are autonomic preganglionic fibers involved mainly in regulating blood flow and glands, not in carrying the primary sensory signals across the mouth. Therefore, the sensory innervation throughout the oral cavity relies on A-type and C-type fibers.