. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 220 ELEMENTS OF BIOLOGY ing embryonic development some of the cells of the neural crest migrate ventrally and take up permanent position in the viscera and elsewhere to become the ganglia of the sympathetic system. The most conspicuous sympathetic ganglia form a chain in the dorsal wall of the body, just ventral to the vertebral column. Fibres from these ganglia ramify to the various organs and tissues, estab-. ANT. N£UftOPOffEi NEURAL FOLD â . NEURAL FOLD ^?? IfPr^--^ .4r'-. Please note th


. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 220 ELEMENTS OF BIOLOGY ing embryonic development some of the cells of the neural crest migrate ventrally and take up permanent position in the viscera and elsewhere to become the ganglia of the sympathetic system. The most conspicuous sympathetic ganglia form a chain in the dorsal wall of the body, just ventral to the vertebral column. Fibres from these ganglia ramify to the various organs and tissues, estab-. ANT. N£UftOPOffEi NEURAL FOLD â . NEURAL FOLD ^?? IfPr^--^ .4r'-. 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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