What type of nerve endings are C fibers?

What type of nerve endings are C fibers?

• A. Encapsulated endings
• B. Special receptors
• C. Synaptic endings
• D. Free (naked) nerve endings

Answer: (D)

Peripheral sensory nerve endings come in free versus encapsulated forms, and the type of nerve fiber often aligns with this morphology. C fibers are unmyelinated, small-diameter, slow-conducting nociceptors that terminate as free (unencapsulated) nerve endings in tissues like the skin and mucosa. Because their endings lack a specialized capsule or end-organ structure, they are classified as free nerve endings. This morphology fits their role in dull, poorly localized pain and warmth sensation, driven by chemical and thermal stimuli. Encapsulated endings, with their capsules, form specialized receptors (like Pacinian, Meissner, Ruffini, and Merkel endings) and are typically tied to other fiber types and modalities such as vibration and discriminative touch. Synaptic endings refer to terminals that make connections to other neurons, not peripheral receptor endings, and special receptors describe a broader category of highly specialized transducers not specific to the naked endings of C fibers.

Peripheral sensory nerve endings come in free versus encapsulated forms, and the type of nerve fiber often aligns with this morphology. C fibers are unmyelinated, small-diameter, slow-conducting nociceptors that terminate as free (unencapsulated) nerve endings in tissues like the skin and mucosa. Because their endings lack a specialized capsule or end-organ structure, they are classified as free nerve endings. This morphology fits their role in dull, poorly localized pain and warmth sensation, driven by chemical and thermal stimuli. Encapsulated endings, with their capsules, form specialized receptors (like Pacinian, Meissner, Ruffini, and Merkel endings) and are typically tied to other fiber types and modalities such as vibration and discriminative touch. Synaptic endings refer to terminals that make connections to other neurons, not peripheral receptor endings, and special receptors describe a broader category of highly specialized transducers not specific to the naked endings of C fibers.