. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. Fig. 217. Primary tubes (tubulations) of the primitive vertebrate body. (A) Sche- matic representation of epidermal, neural, and entodermal tubes in the early embryo of the shark. Observe that a well-developed, post-anal or tail gut continues to the end of the tail. (B) Gut, neural, and epidermal tubes in the amphibian type. (C) Gut, neural, and epidermal tubes in the chick and mammal type. (D) Mesodermal tube in the shark embryo. (E) Mesodermal t
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. Fig. 217. Primary tubes (tubulations) of the primitive vertebrate body. (A) Sche- matic representation of epidermal, neural, and entodermal tubes in the early embryo of the shark. Observe that a well-developed, post-anal or tail gut continues to the end of the tail. (B) Gut, neural, and epidermal tubes in the amphibian type. (C) Gut, neural, and epidermal tubes in the chick and mammal type. (D) Mesodermal tube in the shark embryo. (E) Mesodermal tube in the amphibian embryo. (F) Mesodermal condition in the early bird and mammal embryo. (G) Transverse section of shark embryo, showing tubulations of major organ-forming areas and primary coelomic con- ditions. (H) Transverse section of frog embryo shortly after closure of neural tube, showing the five fundamental body tubes oriented around the notochord. 456. 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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