. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. C 0 Fig. 602. Four steps in the formation of the neural crests during the closure of the neural tube in the pig. (From Messer, An Introduction to Vertebrate Anatomy, copyright 1947, by permission of The Macmillan Company, publishers. After Patten.) All of the nervous tissues of the body are derived, either directly or indirectly, from the medullary tube, with the exception of cells and fibers that contribute to the olfactory epithelium. Epidermal Ectoderm-
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. C 0 Fig. 602. Four steps in the formation of the neural crests during the closure of the neural tube in the pig. (From Messer, An Introduction to Vertebrate Anatomy, copyright 1947, by permission of The Macmillan Company, publishers. After Patten.) All of the nervous tissues of the body are derived, either directly or indirectly, from the medullary tube, with the exception of cells and fibers that contribute to the olfactory epithelium. Epidermal Ectoderm--^ Neural Crest. Central Canal--pO^ Sulcus Limitans- Floor Plate- Fig. 603. Stereogram of early spinal cord, showing formation of neural crests. (After 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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