. A laboratory manual and text-book of embryology. Embryology. Fig. \ Entoderm Jplanchnopkurk Open cjut 46.—Transverse section caudal to the fovea cardiaca of a thirty-six-hour chick embryo. Xoo. Mes. segment- Central celt, of segment •Scm. mesoderm NeuraJ tube Ectoderm Mesonephr'ic duct. Splanchnic, , mesoderm Coelom Descending .. aorta /Votichord, Entoderm Fig. 47.—Transverse section through the fourteenth pair of mesodermal segments of a thirty-six-hour chick embryo. X 90. Section through the Fourteenth Pair of Primitive Segments (Fig. 47).—The body of the embryo is now flattened on the sur
. A laboratory manual and text-book of embryology. Embryology. Fig. \ Entoderm Jplanchnopkurk Open cjut 46.—Transverse section caudal to the fovea cardiaca of a thirty-six-hour chick embryo. Xoo. Mes. segment- Central celt, of segment •Scm. mesoderm NeuraJ tube Ectoderm Mesonephr'ic duct. Splanchnic, , mesoderm Coelom Descending .. aorta /Votichord, Entoderm Fig. 47.—Transverse section through the fourteenth pair of mesodermal segments of a thirty-six-hour chick embryo. X 90. Section through the Fourteenth Pair of Primitive Segments (Fig. 47).—The body of the embryo is now flattened on the surface of the yolk. The dorsal aortae have sepa- rated and occupy the depressions lateral to the primitive segments. The section is characterized by the differentiated mesoderm which forms the primitive segments, nephrotomes, somatic and splanchnic mesoderm, structures soon to be described. Transverse Section through the Rhomboidal Sinus (Fig. 48).—The neural groove is open, the notochord is oval in form. The ectoderm is characterized by the columnar form of its cells. At the point where the ectoderm joins the neural fold a crest of cells projects ventrally on either side. These projecting cells form the neural crests, and from them the spinal ganglia are formed. The mesodermal plates have split laterally into layers, but the ccelomic cavities are mere slits. Between the splanchnic mesoderm and the entoderm blood-vessels may be 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 Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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