Text book of Elementary Zoology for Secondary Educational Institutions
Text book of Elementary Zoology for Secondary Educational Institutions
Thomas Walton Galloway
The book Text book of Elementary Zoology for Secondary Educational Institutions was written by author Thomas Walton Galloway Here you can read free online of Text book of Elementary Zoology for Secondary Educational Institutions book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Text book of Elementary Zoology for Secondary Educational Institutions a good or bad book?
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The fibres are merely outgrowths which conduct impulses to and from the ganglia. The ganglion cells are massed together in nerve centres, such as the brain. The term ganglion is also applied to one of these groups of cells. When several fibres are bound together they are called a nerve. The ganglion cell and its various fibres are to be looked upon as a unit. Fig. 25 shows the parts of such a unit. The whole nervous system of an animal is made up of numerous units of this type more or less join...ed together. Nervous tissue arises in the embryo from the ectoderm. It is so highly specialized that its cells are probably incapable of division after they are once differentiated. This means that all the nervous cells are produced early in life, and that under ordinary circumstances no new ones are formed. Probably all we can do with them is to educate more highly those that we have. 131. Organs. The tissues which have just been described are rarely, if ever, pure and independent; but are associated with one another in different ways.
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