. Comparative anatomy. Anatomy, Comparative. KIDNEY GENITAL RIDGE MESENCHYME- DIGESTIVE TRACT- COELOI PERITONEUM SPINAL CORD NOTOCHORD. NEURENTERIC "CANAL ANAL PIT ^ , "'-DIGESTIVE TRACT MOUTH PIT—^yy ^ GILL CLEFT&^\S;lo>:=^5^,g;3fc^^,,;:;,j^^ p '^ •^UVER OUTGROWTH Fig. 266.—Stereograms of stages in the ontogenesis of the chordate showing early stages in the development of the digestive system. A, B, and C are based upon early stages in the development of Amphioxus; D and E upon elasmobranch embryos; F upon an amphibian embryo. F represents the right half of an embryo cut in a
. Comparative anatomy. Anatomy, Comparative. KIDNEY GENITAL RIDGE MESENCHYME- DIGESTIVE TRACT- COELOI PERITONEUM SPINAL CORD NOTOCHORD. NEURENTERIC "CANAL ANAL PIT ^ , "'-DIGESTIVE TRACT MOUTH PIT—^yy ^ GILL CLEFT&^\S;lo>:=^5^,g;3fc^^,,;:;,j^^ p '^ •^UVER OUTGROWTH Fig. 266.—Stereograms of stages in the ontogenesis of the chordate showing early stages in the development of the digestive system. A, B, and C are based upon early stages in the development of Amphioxus; D and E upon elasmobranch embryos; F upon an amphibian embryo. F represents the right half of an embryo cut in a median longi- tudinal section. The blastopore has been converted into the neurenteric canal. (From "Being Well Born," by M. F. Guyer, Copyright 1916, 1917, used by special permission of the publishers, The Bobbs-Merrill Company.) gut, with which it retains connexion by an allantoic stalk. The cloaca is the posterior portion of the hind-gut into which allantois and intestine open, and which is closed to the exterior by the cloacal membrane. The later development of the intestine involves its elongation and twisting. The opening into the yolk-sac becomes reduced to a slender. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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