Myelin sheath

myelin sheaths around the axons of their neurons. This permits much more rapid transmission of nerve impulses — a trait probably as important for active vertebrates as their jaws.
an adaptive immune system backing up their innate immune system.
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myelin sheath: a fatty layer of material that covers the axons of nerve cells.
myofibrils: microscopic filaments that make up a muscle cell.
myosin: a protein microfilament that comprises the sarcomere of muscle cells.
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myelin sheath
(my-eh-lin) [Gk. myelinos, full of marrow]
In a neuron, an insulating coat of cell membrane from Schwann cells that is interrupted by nodes of Ranvier where saltatory conduction occurs.
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myelin sheath Layers of specialized glial cells, called Schwann cells, that coat the axons of many neurons.
myofibrils Striated contractile microfilaments in skeletal muscle cells. PICTURE ...
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myelin sheath - insulating layer of specialized cell membrane wrapped around vertebrate axons; produced by the oligodendrocytes in the central nervous system (CNS) ...
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Multiple sclerosis is a disease of the central nervous system characterized by the destruction of the myelin sheath surrounding neurons, resulting in the formation of "plaques.
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The loss of muscle coordination that people with multiple sclerosis face is due to the degeneration of the myelin sheath in classes of neurons that are involved in the movement of muscles.
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neurofibril node Regular gaps in a myelin sheath around a nerve fiber; formerly called node of Ranvier.
neurogenic Originating in nervous tissue, as does the rhythmical beat of some arthropod hearts.
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The disease multiple sclerosis (MS) is due to a breakdown of myelin sheathing, and degrades muscle control by destroying axons' ability to conduct action potentials.
Refractory period ...
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nodes of Ranvier
the small gaps in the myelin sheath between successive ganglia cells along the axon of a neuron; also, the site of high concentration of voltage-sensitive ion channels.
Nostoc
a blue-green algae.
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The myelin sheath in peripheral nerves normally runs along the axon in sections about 1 mm long, punctuated by unsheathed nodes of Ranvier which contain a high density of voltage-gated ion channels.
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