. The development of the chick; an introduction to embryology. Birds -- Embryology. 234 THE DEVELOPMENT OF THE CHICK cells the nuclei are at different levels; thus in a section several layers of nuclei appear. These cells are not closely packed together, except at their outer ends, but are more or less separated by intercellular spaces that form a communicating system of narrow channels. ,. Fig. 138. —Structure of the wall of the neural tube. Trans- verse section through the region of the twenty-first somite of a 29 s embryo. Drawn with Zeiss 2 mm. oil-immersion. c. C, Central canal, ep.
. The development of the chick; an introduction to embryology. Birds -- Embryology. 234 THE DEVELOPMENT OF THE CHICK cells the nuclei are at different levels; thus in a section several layers of nuclei appear. These cells are not closely packed together, except at their outer ends, but are more or less separated by intercellular spaces that form a communicating system of narrow channels. ,. Fig. 138. —Structure of the wall of the neural tube. Trans- verse section through the region of the twenty-first somite of a 29 s embryo. Drawn with Zeiss 2 mm. oil-immersion. c. C, Central canal, ep. C, Epithelial cells, g. C, Ger- minal cells. Ms'ch., Mesenchyme. The germinal cells are rounded cells situated next the central canal between the inner ends of the epithelial cells; karyokinetic figures are very common in them. According to His the germinal cells are the parent cells of the neuroblasts alone; it is probable, however, that they are not so limited in function, and that they represent primitive cells from which proceed other epithelial cells and embryonic neuroglia cells as well as 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, Holt
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