Nociceptors - Nociceptive fibers - Sensory nerve fibers and their types
6 important questions on Nociceptors - Nociceptive fibers - Sensory nerve fibers and their types
In addition to stimulus type, location and structure, sensory receptors are the catergorised by another 2 catergories that determine how fast they transmit signals from the body to the brain. What are these catergories?
Which sensory nerve fibers innervate the Muscle vs. Skin
Skin: Innervated by Aβ (A beta), Aδ (A delta), and C fibers
How large and fast are Aα (A alpha) nerve fibers?
What kind of sensory nerve fibers fall into this catergory?
fast speed (35–75 m/sec)
These serve as proprioceptors for skeletal muscles
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How large and fast are Aβ (A beta) nerve fibers?
What kind of sensory nerve fibers fall into this catergory?
moderate speed (35–75 m/sec)
These are linked to mechanoreceptors in the skin
How large and fast are Aδ (A delta) nerve fibers?
What kind of sensory nerve fibers fall into this catergory?
What is their level of myelinitety and what does it mean about their function.
low speed (5-30m/sec)
nociceptors and thermoceptors
lightly myelinated therefore conduct "fast" or "early" pain signals and are associated with acute (sharp) pain.
How large and fast are sensory C fibers?
What kind of sensory nerve fibers fall into this catergory?
Level of myelinitety? And affect on function
They transmit signals very slowly (0.5–2 m/sec),
unmyelinated fibers therefore communicate "second pain," which is a dull, long-lasting ache or burning sensation
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