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Encyclopedia Britannica



NERVOUS

This article appears in Volume V25, Page 670 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: NAN-NEW
NERVOUS
SYSTEM
 ). The
nerve
  cells are arranged in three
main
 
columns, ventral, intermedio-lateral and posterior vesicular. The ventral cell column has the longest cells, and these are again sub-divided into antero-mesial, antero lateral,
postern
 -lateral and central groups. The intermedio lateral cell column is found in the lateral horn of the thoracic region.
compressed central canal (see fig. 5). The
original
  ectodermal cells elongate and, radiating outward from the canal, are now known as spongioblasts, while the inner ends of some of them
bear
  cilia and so the canal becomes ciliated. A number of round. cells, known as germinal cells, now appear close to the central canal, except at the thin -mid-dorsal and mid-ventral laminae (roof-
plate
  and floor-
plate
 ). From the division of these the primitive
nerve
  cells or neuroblasts are formed and these later on migrate from the region


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