. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MULTICELLULAR ANIMALS 217 the development of the vertebrate embryo by the sinking inward of a plate of ectoderm along the dorsal mid-line of the newly estab- lished body. This plate soon becomes a distinct groove, the margins of which approach each other and finally fuse together, thus form- ing a tube of ectoderm embedded in the surrounding mesoderm (Fig. 147). So the neural tube is established early in the life of the individual; by differentiation of various regions of this tube the centra
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MULTICELLULAR ANIMALS 217 the development of the vertebrate embryo by the sinking inward of a plate of ectoderm along the dorsal mid-line of the newly estab- lished body. This plate soon becomes a distinct groove, the margins of which approach each other and finally fuse together, thus form- ing a tube of ectoderm embedded in the surrounding mesoderm (Fig. 147). So the neural tube is established early in the life of the individual; by differentiation of various regions of this tube the central nervous system is set up. Dorsal and lateral to the primitive PROSEN- CEPHALON MESENCEPHALON PHOMBEN- CEPHALON. MESENCEPHALON DIENCEPHALON METENCEPHALON TELENCEPHALON. 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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