Definitions

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  • noun Plural form of neuroblast.

Etymologies

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Examples

  • 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.

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  • Choi, J. Lovostatin induces apopotosis of spontaneously immortalized rat brain neuroblasts: involvement of nonsterol isoprenoid cells (3T3).

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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.

    IX. Neurology. 2. Development of the Nervous System

  • 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.

    IX. Neurology. 2. Development of the Nervous System

  • 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).

    IX. Neurology. 2. Development of the Nervous System

  • 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.

    IX. Neurology. 2. Development of the Nervous System

  • 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).

    IX. Neurology. 2. Development of the Nervous System

  • 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).

    IX. Neurology. 2. Development of the Nervous System

  • The motor or efferent nerves arise as outgrowths of the neuroblasts situated in the basal laminæ of the mid - and hindbrain.

    IX. Neurology. 2. Development of the Nervous System

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