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Indigo A treatise on comparative embryology Volume 1 | Erin Mills Town Centre
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...of the above mode of development, where the food material is still more bulky and the blastopore closed, is found in Nassa, and has already been described (vide p. 193). The stomodcetim. The stomodaeum in most cases is formed as a simple epiblastic invagination which meets and opens into the mesenteron. When the blastopore remains permanently open at the oral region the stomodaeum is formed as an epiblastic wall round its opening. In all cases the stomodaeum gives rise to the mouth and oesophagus. At a subsequent period there are developed in the oral region of the stomodaeum the radula in a special ventral pit, and the salivary glands--the latter as simple outgrowths. The oesophagus is usually ciliated. The proctodeum. Except where the blastopore remains as the permanent anus (Paludina) the proctodaeum is always formed subsequently to the mouth. Its formation is usually preluded by the appearance of two projecting epiblast cells, but it is always developed as a very shallow epiblastic invagination, which does not give rise to any part of the true intestine. In the Cephalopods the alimentary tract is formed, as in other cephalophorous Mollusca, of three sections. (1) A stomodamm, formed by an epiblastic invagination, which gives rise to the mouth, oesophagus and salivary glands. (2) A proctodeuin, which is an extremely small epiblastic invagination. (3) A mesenteron, lined by true hypoblast, Fig. 126. Longitudinal Vertical Section Through A Loligo Ovum When The MESENTERIC CAVITY Is JUST COMMENCING TO RE FORMED. (After Bobretzky.) gh. salivary gland; brd. sheath of radula; oe. oesophagus; dt. yolk-sack; dig. shellgland; mt. mantle; pdh. mesenteron; x. epiblastio thickening between the folds of the funnel. which forms the main section of...
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...of the above mode of development, where the food material is still more bulky and the blastopore closed, is found in Nassa, and has already been described (vide p. 193). The stomodcetim. The stomodaeum in most cases is formed as a simple epiblastic invagination which meets and opens into the mesenteron. When the blastopore remains permanently open at the oral region the stomodaeum is formed as an epiblastic wall round its opening. In all cases the stomodaeum gives rise to the mouth and oesophagus. At a subsequent period there are developed in the oral region of the stomodaeum the radula in a special ventral pit, and the salivary glands--the latter as simple outgrowths. The oesophagus is usually ciliated. The proctodeum. Except where the blastopore remains as the permanent anus (Paludina) the proctodaeum is always formed subsequently to the mouth. Its formation is usually preluded by the appearance of two projecting epiblast cells, but it is always developed as a very shallow epiblastic invagination, which does not give rise to any part of the true intestine. In the Cephalopods the alimentary tract is formed, as in other cephalophorous Mollusca, of three sections. (1) A stomodamm, formed by an epiblastic invagination, which gives rise to the mouth, oesophagus and salivary glands. (2) A proctodeuin, which is an extremely small epiblastic invagination. (3) A mesenteron, lined by true hypoblast, Fig. 126. Longitudinal Vertical Section Through A Loligo Ovum When The MESENTERIC CAVITY Is JUST COMMENCING TO RE FORMED. (After Bobretzky.) gh. salivary gland; brd. sheath of radula; oe. oesophagus; dt. yolk-sack; dig. shellgland; mt. mantle; pdh. mesenteron; x. epiblastio thickening between the folds of the funnel. which forms the main section of...
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