. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MESENCEPHALON DIENCEPHALON METENCEPHALON TELENCEPHALON. OPTIC VESICLE MYELENCEPHALON B. Fig. 147.—Two early stages in the embryonic development of a vertebrate brain. In A the view is dorsal and the brain consists essentially of three parts. In B the view is lateral and the differentiation of five parts is clear. neural tube there remain masses of ectodermal cells that are not incorporated into the tubular central nervous system but are des- tined to form ganglia associated with the neural tu
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MESENCEPHALON DIENCEPHALON METENCEPHALON TELENCEPHALON. OPTIC VESICLE MYELENCEPHALON B. Fig. 147.—Two early stages in the embryonic development of a vertebrate brain. In A the view is dorsal and the brain consists essentially of three parts. In B the view is lateral and the differentiation of five parts is clear. neural tube there remain masses of ectodermal cells that are not incorporated into the tubular central nervous system but are des- tined to form ganglia associated with the neural tube and the ganglia of the sympathetic system. These masses of potentially nervous ectodermal cells are spoken of as the neural crest. The Central Nervous System. Essentially then, the cen- tral nervous system of the vertebrates is a tube situated dorsal to the coelom, the walls of which are composed of nerve cells and associ- ated connective tissues. During development in all vertebrates the anterior region of the tube, by unequal growth, dilates to form three primary expansions, the fore-, mid-, and hind-brains, or, more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buchanan, James William, 1888-. New York, London, Harper & brothers
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