Rosenbluth says "We see now that an unmyelinated
fiber will conduct.
uptake by unmyelinated
autonomic neurons and axonal transport to the spinal cord (sympathetic neurons) or brainstem (parasympathetic neurons) to the brain;
Tissue damage will stimulate nociceptors and generate an action potential, which is transmitted by thin myelinated Aa fibres and unmyelinated
C fibres (both are called primary afferents) to the dorsal horn in the spinal cord.
To pass my excitement along to my students and to clarify the effects of myelin on neuronal activity, I use a tangible analogy to teach action potential conduction down unmyelinated
versus myelinated axons.
Because NGF is released from airway epithelial cells, increases the production and release of substance P and other tachykinins from adult sensory neurons, and induces sensory hyperinnervation in the airways of transgenic mice, it represents an ideal link between virus-infected respiratory epithelium and the dense subepithelial network of unmyelinated
axons were normal (Figure 2, left column).
The mix of unmyelinated
nerve cells from embryonic mice, cells that don't produce NRG1-III, and glial cells from adult rats showed no myelination.
These can be either myelinated (single axon) or unmyelinated
fibers conduct very slowly (approximately 1 meter/second), while the speed of conduction in myelinated fibers depends on the total thickness of the fiber.
neurons with thin, unmyelinated
, corticopedal fibers projecting from cell bodies in the brain stem, including the acetylcholine neurons of the nucleus basalis of Meynert (detail learning), the norepinephrine neurons of the locus coeruleus (reward-related learning/Skinnerian conditioning), and the serotonin neurons of the dorsal raphe nucleus (classical/ Pavlovian conditioning).
Skin punch biopsy specimens contain small unmyelinated
nerve fibers that are damaged in early diabetes.
Sensory nerve conduction threshold was measured in large myelinated, small myelinated, and unmyelinated