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NERVOUS

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Originally appearing in Volume V25, Page 670 of the 1911 Encyclopedia Britannica.
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NERVOUS See also:

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

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