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 ?
Cable equation for a myelinated axon derived from its microstructure.
Myelin: A white fatty material composed chiefly of alternating layers of lipids and lipoproteins that encloses the axons of myelinated nerve fibers.
As a result of selectivity for smaller, myelinated fibers that fire at high frequency, local pain and temperature fibers are much more sensitive to these agents than pressure, proprioceptive, and motor fibers.
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 initial injury in the diabetic patient is from chronic hyperglycemia, and the first damage occurs in the blood vessels at the endothelial cell (5) interfering with the myelinated nerve fibers and causing damage and interfering with nerve blood flow.
Myelinated afferents signal the hyperalgesia associated with nerve injury.
Myelinated fibres conduct nerve impulses rapidly, whereas unmyelinated fibres tend to conduct quite slowly.
A sampling of contents: optimal signal processing for brain-machine interfaces, functional characterization of adaptive visual encoding, restoration of movement by implantable neural motor prostheses, advances in retinal neuroprosthetics, muscle synergies for motor control, cable equation model for myelinated nerve fiber, and nonlinear approaches to learning and memory.
For every hour an acute ischemic stroke is untreated, the human forebrain loses 120 million neurons, 830 billion synapses, and 447 miles of myelinated fiber--the equivalent of 3.
Traditionally, the procedure did not include anaesthesia, due to the belief that infants did not feel pain because their nerves were not completely myelinated (Cope, 1998).
The central nervous system tracts that subserve pain are completely myelinated by 30 weeks.
Most previous studies have relied on pudendal nerve terminal motor latency, but this test is abnormal only when the largest, most heavily myelinated nerves are damaged; it does not detect subtle injury.