unmyelinated
Without nerve insulation
Unmyelinated describes nerve fibers that lack a myelin sheath—the fatty insulating layer that speeds electrical signals along neurons.
Unmyelinated nerves conduct impulses more slowly: unmyelinated C fibers transmit dull, aching pain.
The term appears in anatomy, neuroscience, and medicine when distinguishing nerve fiber types.
Neuron's signal-sending projection
- nerve fiberSignal-conducting neural extension
- neuronImpulse-conducting cell
- conductionHeat transfer through contact
- action potentialNeuron's rapid electrical discharge
peripheral nerve · nerve impulse · node of Ranvier · white matter · gray matter · neuroglial · afferent · efferent
Combustion in progress
- achingExperiencing dull pain
- dull painMuted, lingering bodily discomfort
- chronic painEnduring physical suffering
- visceral painDiscomfort from internal organs
itch · autonomic · capsaicin · substance P · pain threshold · neuropathy · referred pain · deep pain
Of the unborn
- embryonicAt earliest developmental stage
- immatureNot fully developed
- prenatalBefore birth
- differentiationRecognizing meaningful differences
maturation · neurogenesis · postnatal · premature infant · developmental delay · neural tube · peripheral nervous system · central nervous system
axon
Neuron's signal-sending projection
- nerve fiberSignal-conducting neural extension
- neuronImpulse-conducting cell
- conductionHeat transfer through contact
action potential · peripheral nerve · nerve impulse · node of Ranvier · white matter · gray matter · neuroglial · afferent · efferent · soma
burning
Combustion in progress
- achingExperiencing dull pain
- dull painMuted, lingering bodily discomfort
- chronic painEnduring physical suffering
visceral pain · itch · autonomic · capsaicin · substance P · pain threshold · neuropathy · referred pain · deep pain · tissue damage
fetal
Of the unborn
differentiation · maturation · neurogenesis · postnatal · premature infant · developmental delay · neural tube · peripheral nervous system · central nervous system