myelinated fiber


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Related to myelinated fiber: myelin sheath

myelinated fiber

(mī′ə-lə-nā′tĭd)
n.
An axon enveloped by a myelin sheath formed by oligodendroglial cells in the brain and spinal cord or by Schwann cells in the peripheral nerves.

myelinated fiber

A nerve fiber whose axon (dendrite) is wrapped in a myelin sheath.
See also: fiber
References in periodicals archive ?
Myelinated fibers were identified by the presence of either NaD channel clusters at the nodes of Ranvier (data not shown) or MAG clusters at the paranodal regions.
An efficient and unbiased stereological method was applied to estimate the white matter volume, the total volume, total length and mean diameter of the myelinated fibers in the white matter and the total volume of the myelin sheaths in the white matter of rat brain.
The pathological changes of myelinated fibers were divided into 3 groups: (1) pure onion bulb formation, (2) onion bulb formation with axonal sprouts, and (3) focally thickened myelin with onion bulb structures or axonal sprouts.
The G ratio values closer to 0.6 was defined by Rushton as the optimal ratio for the maximum conduction velocity of a myelinated fiber. The unimodal G ratio distribution, with peak at 0.6 observed in both sural and saphenous nerves indicates that animals with 30 days of life present myelinated fibers fully developed and prepared to the best spread of the current between two Ranvier nodes.
(b) 30 min postketamine injection myelinated fibers (MyN) and spinal ganglion cells, vacuole-like structures (thin arrow).
Semithin transverse sections of the left sural nerve revealed a decreased density of large myelinated fibers, and the remaining fibers frequently presented with thin myelinated axon and onion bulb changes caused by the proliferation of Schwann cells.
Our quantitative analysis showed a significant increase in the number of preserved myelinated fibers in the calpain inhibitor-treated group compared with those in the vehicle-treated group (Figure 3A).
The mean diameter of the myelinated fibers and axons as well as the mean thickness of the myelin sheaths was measured.
Ultrastructural and morphometric studies of the peripheral nerves reveal loss of unmyelinated and small myelinated fibers and no innervation to the sweat glands.