myelinated


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Related to myelinated: myelinated nerve, myelinated fibers

sheath

 [shēth]
a tubular case or envelope.
arachnoid sheath the delicate membrane between the pial sheath and the dural sheath of the optic nerve.
carotid sheath a portion of the cervical fascia enclosing the carotid artery, internal jugular vein, vagus nerve, and sympathetic nerves supplying the head.
connective tissue sheath of Key and Retzius endoneurium.
crural sheath femoral sheath.
dural sheath the external investment of the optic nerve.
femoral sheath the fascial sheath of the femoral vessels.
Henle's sheath endoneurium.
lamellar sheath the perineurium.
medullary sheath myelin sheath.
myelin sheath (nerve sheath) the sheath surrounding the axon of myelinated nerve cells, consisting of concentric layers of myelin formed in the peripheral nervous system by the plasma membrane of Schwann cells, and in the central nervous system by the plasma membrane of oligodendrocytes. It is interrupted at intervals along the length of the axon by gaps known as nodes of Ranvier. Myelin is an electrical insulator that serves to speed the conduction of nerve impulses (see saltatory conduction).
pial sheath the innermost of the three sheaths of the optic nerve.
root sheath the epidermic layer of a hair follicle.
sheath of Schwann neurilemma.
synovial sheath synovial membrane lining the cavity of a bone through which a tendon moves.
tendon sheath a lubricated fibrous or synovial layer of tissue in which the tendon is housed and through which it moves.

my·e·li·nat·ed

(mī'ĕ-li-nāt'ed),
Having a myelin sheath.
Synonym(s): medullated (2)

myelinated

/my·eli·nat·ed/ (mi´ĕ-lĭ-nāt″ed) having a myelin sheath.

myelinated

(mī′ə-lə-nā′tĭd)
adj.
Having a myelin sheath: myelinated nerve fibers.

myelinated

[mī′əlinā′tid]
(of a nerve) having a myelin sheath.

my·e·li·nat·ed

(mī'ĕ-li-nā-tĕd)
Having a myelin sheath.
Synonym(s): medullated (2) .

myelinated

Possessing a MYELIN sheath.

myelinated

having a myelin sheath.

Patient discussion about myelinated

Q. What is Myelin?

A. As part of the nervous system, myelin lines nerve fibers to protect and insulate neurons. Myelin aids in the quick and accurate transmission of electrical current carrying data from one nerve cell to the next. When myelin becomes damaged, the process involves numerous health conditions, including multiple sclerosis.

Dysfunction in the myelin of nerve fibers causes the interruption of smooth delivery of information. Either nerve impulses can be slowed, such that we can't pull our hand away in time to avoid being burned, or mixed up, so we aren't able to determine if a pan is hot in the first place. This is akin to a pet chewing on a wire, causing the device to dysfunction. When problems arise in nerves of the PNS, neuropathy might result, and when injury affects the nerves of the CNS, multiple sclerosis is often diagnosed.

More discussions about myelinated
References in periodicals archive ?
From our observations the myelinated nerve fibers from the D-gal-treated mice exhibited dilatation with irregular morphology and the myelin lamellae were loosened with obvious splitting.
In addition, Adam and Friede (1988), collected morphological data on Frog's sciatic nerve which and demonstrates continuous addition of new myelinated and non-myelinated fibers with body growth.
The first type is myelinated and fast conducting; the second is unmyelinated and slow conducting.
The more myelinated a neuron, the more efficient it is in synthesizing and sending messages.
The study suggests that VaD should be suspected when individuals with vascular risk factors show dysfunctions in neuropsychological performance (involving mental functions such as cognitive processing speed, executive function, language, and episodic memory) and changes in white matter (the tissue of the brain composed of whitish myelinated nerve fibers that form the communications networks of brain cells).
Previously, we showed a drastic decline in the expression of glial and neuronal proteins in myelinated peripheral nerves with age, which is significantly ameliorated by lifelong calorie restriction.
The evidence suggests that effects of spinal manipulative therapy is primarily neurophysiologic, most likely mediated by intense stimulation of large myelinated fibers in the capsular and/or periarticular tissues.
Akassoglou's team, which includes Dimitrios Davalos, PhD, a postdoctoral fellow funded by the Society, has developed a way to adapt two-photon microscopy to get live images of myelinated areas by exposing only a very small area of the spinal cord of an anesthetized mouse.
1985) and is strictly valid only for unmyelinated axons, although myelinated axons should behave continuously to a good approximation (Basser 1993).
Schwannomas are neurogenic benign tumors that arise from a proliferation of Schwann cells in the peripheral sheath of myelinated nerves.
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.
As a neuroscientist, I am easily excited by the concept of the saltatory conduction of action potentials down a myelinated neuron.