Results 201 to 210 of about 53,780 (245)
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Glycoproteins of myelin sheaths
Journal of Molecular Neuroscience, 1997A growing number of glycoproteins have been identified and characterized in myelin and myelin-forming cells. In addition to the major P0 glycoprotein of compact PNS myelin and the myelin-associated glycoprotein (MAG) in the periaxonal membranes of myelin-forming oligodendrocytes and Schwann cells, the list now includes peripheral myelin protein-22 (PMP-
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Anisotropic properties of the myelin sheath
Acta Histochemica, 1980Form birefringence curves were determined for fixed (and unfixed rat axons before and after lipid extraction. The total detected birefringence was assumed to be due to the macromolecular array of myelin sheath components (phospholipids, cholesterol, and proteins). Unfixed nerves displayed negative form birefringence.
B, de Campos Vidal +3 more
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Science's STKE, 2006
The myelin sheath electrically insulates axons and makes the conductance of neuronal impulses much more efficient. Chan et al . examined how the Schwann cells begin myelination of an axon. In neuronal cultures, a cell polarity protein, Par-3, localized to where the Schwann cell meets the axon and promoted the ...
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The myelin sheath electrically insulates axons and makes the conductance of neuronal impulses much more efficient. Chan et al . examined how the Schwann cells begin myelination of an axon. In neuronal cultures, a cell polarity protein, Par-3, localized to where the Schwann cell meets the axon and promoted the ...
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Evolution of myelin sheaths: Both lamprey and hagfish lack myelin
Neuroscience Letters, 1984Modern views of agnathan phylogeny consider Petromyzoniformes and Myxiniformes to belong to distinct classes that diverged from a common ancestor at a remote period, perhaps in the lower Cambrian, greater than 600 million years ago. Both are more primitive than elasmobranchs, holocephalans and bony fishes.
T H, Bullock, J K, Moore, R D, Fields
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Morphology of Cryofixed Myelin Sheath
1998The myelin sheath is formed by concentrically apposed membrane pairs and shows a regularly layered pattern of alternating light lines and dense lines. Observation of cryofixed myelin demonstrated that the structures represent aqueous spaces. All lamellae of the myelin sheath show globular aggregates of particles and these particles are corresponding ...
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1981
The presence of a myelin sheath around nerve cell bodies in some sensory ganglia was first mentioned by Wagner (1846, quoted by Munzer 1931) and Bidder (1847). However, these authors did not appreciate the exact meaning of their finding. A little later, Leydig (1851) not only described the myelin sheath enveloping the nerve cell bodies in the ...
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The presence of a myelin sheath around nerve cell bodies in some sensory ganglia was first mentioned by Wagner (1846, quoted by Munzer 1931) and Bidder (1847). However, these authors did not appreciate the exact meaning of their finding. A little later, Leydig (1851) not only described the myelin sheath enveloping the nerve cell bodies in the ...
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Calcium control of myelin sheath growth
Nature Neuroscience, 2017New studies provide compelling evidence that the number and length of myelin sheaths generated by oligodendrocytes in the CNS are controlled by local calcium levels, linking axonal activity to individual myelin sheath formation.
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Oligodendrocyte calcium signaling sculpts myelin sheath morphology
2023SUMMARYMyelin is essential for rapid nerve signaling and is increasingly found to play important roles in learning and in diverse diseases of the CNS. Morphological parameters of myelin such as sheath length and thickness are regulated by neuronal activity and can precisely tune conduction velocity, but the mechanisms controlling sheath morphology are ...
Manasi Iyer +10 more
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Phagocytosis of myelin sheath fragments by dendrites
Experimental Brain Research, 1987In serial ultrathin sections of the frog spinal cord, profiles of dendritic appearance were identified that contained myelin fragment inclusions and received synaptic contacts. In a number of cases it could be established that the inclusions were derived from adjacent myelin sheaths.
M, Antal, G, Székely
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Relation between myelin sheath thickness, internode geometry, and sheath resistance
Experimental Neurology, 1986The thickness of the myelin sheath of nerve fibers was traditionally assessed solely as a function of axon caliber. Studies concerning the additional effect of variation in internode length are of relatively recent date. Carefully calibrated measurements of sheath thickness and internode geometry were used in this study to define an equation to predict
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