. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. TUBULATION OF ORGAN-FORMING AREAS IN AMPHIOXUS 501 entoderm continues slowly in a caudal direction from the anterior end until an embryonic condition is reached approximating about 13 to 14 pairs of mesodermal segments. At this level, the notochord and mesoderm become completely separated from the entoderm. As a result, the enteric or gut tube from this point in its growth posteriad is a separate entity. (See tubulation of mesoderm on p. 505. Ante
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. TUBULATION OF ORGAN-FORMING AREAS IN AMPHIOXUS 501 entoderm continues slowly in a caudal direction from the anterior end until an embryonic condition is reached approximating about 13 to 14 pairs of mesodermal segments. At this level, the notochord and mesoderm become completely separated from the entoderm. As a result, the enteric or gut tube from this point in its growth posteriad is a separate entity. (See tubulation of mesoderm on p. 505. Anterior to the fourteenth somite, after the notochord and mesoderm separate from the entoderm, the latter grows medially from either side to complete the entodermal roof below the evaginated notochord and mesoderm (fig. 250A). A primitive metenteric tube thus is formed, as shown in figure 249C, whose only opening is that which leads by way of the neurenteric canal (fig. 249A, C) into the neurocoel of the neural tube and from thence to the outside through the anterior neuropore. NEURAL PLATE CELLS NEURAL PLATE. 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 Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston
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