Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
neuroblast .
Etymologies
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Examples
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In the fly, the nervous system develops from progenitor cells called neuroblasts, arranged into 18 segments that are lined up down the length of the larval body.
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In the fruit fly's developing brain, stem cells called neuroblasts normally divide to create one self-renewing neuroblast and one cell that has a different fate.
PhysOrg.com - latest science and technology news stories 2009
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Choi, J. Lovostatin induces apopotosis of spontaneously immortalized rat brain neuroblasts: involvement of nonsterol isoprenoid cells (3T3).
T.S. Wiley: Estrogen Dilemma: There Is No Dilemma When You Know the Details T.S. Wiley 2010
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By subdivision the germinal cells give rise to the neuroblasts or young nerve cells, which migrate outward from the sides of the central canal into the mantle layer and neural crest, and at the same time become pear-shaped; the tapering part of the cell undergoes still further elongation, and forms the axiscylinder of the cell.
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Pear-shaped neuroblasts are developed in the alar and basal laminæ. and their narrow stalks are elongated to form the axis-cylinders of the nerve fibers.
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The fibers of the anterior roots are formed by the axons of the neuroblasts which lie in the ventral part of the mantle layer; these axons grow out through the overlying marginal layer and become grouped to form the anterior nerve root (Fig. 641).
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The first to develop are the short intersegmental fibers from the neuroblasts in the mantle zone, and the fibers of the dorsal nerve roots which grow into the medulla spinalis from the cells of the spinal ganglia.
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The mantle layer represents the whole of the future gray columns of the medulla spinalis; in it the cells are differentiated into two sets, viz., (a) spongioblasts or young neuroglia cells, and (b) germinal cells, which are the parents of the neuroblasts or young nerve cells (Fig. 641).
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This thickening is the rudiment of the anterior column of gray substance, and contains many neuroblasts, the axis-cylinders of which pass out through the marginal layer and form the anterior roots of the spinal nerves (Figs. 640, 642, 643).
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The motor or efferent nerves arise as outgrowths of the neuroblasts situated in the basal laminæ of the mid - and hindbrain.
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