. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE NERVOUS SYSTEM 243 the seventh day the dorsal portion begins to be obUterated by fusion of the ependymal cells, and is thus reduced to an epen- dymal septum. On the eighth day this process has involved the upper third of the canal; the form of the canal is roughly wedge- shaped, pointed dorsally and broad ventrally (Fig. 145). The continuation of this process leaves only the ventral division as the permanent canal. At the extreme hind end of the cord the central canal becomes dilated to form a
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. THE NERVOUS SYSTEM 243 the seventh day the dorsal portion begins to be obUterated by fusion of the ependymal cells, and is thus reduced to an epen- dymal septum. On the eighth day this process has involved the upper third of the canal; the form of the canal is roughly wedge- shaped, pointed dorsally and broad ventrally (Fig. 145). The continuation of this process leaves only the ventral division as the permanent canal. At the extreme hind end of the cord the central canal becomes dilated to form a relatively large pear-shaped chamber with thin undifferentiated walls (Fig. 148); the terminal wall is still fused with the ectoderm at eight days, and the chamber appears to have a maximum size at this time. At eleven days the fusion with the ectoderm still exists, and the cavity is ll' £.K :â â %. 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 Lillie, Frank Rattray, 1870-1947. New York : Henry Holt
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
