Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 58 OBGAIxiZATION A>*D DLVELOrMJZXT OF IX GEXPUAL. K the Invertebrata it is often possible to distinguish an anterior especially widened portion of the intestine, which receives the hepatic secretion and is called stomach from the posterior, narrower, and longer section, which is known as intestine. The hindermost section of the alimentary canal or hind gut, which is not always sharply marked off from the intestine, is especially concerned wi
Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 58 OBGAIxiZATION A>*D DLVELOrMJZXT OF IX GEXPUAL. K the Invertebrata it is often possible to distinguish an anterior especially widened portion of the intestine, which receives the hepatic secretion and is called stomach from the posterior, narrower, and longer section, which is known as intestine. The hindermost section of the alimentary canal or hind gut, which is not always sharply marked off from the intestine, is especially concerned with the collection and expulsion of the undigested remains of the food, or freces. It may also possess CEecal appendages attached to its anterior part, and possessing a digestive function. In the lower animals it is a small structure, but in the higher animals it at- tains a much more considerable length, and receives anteriorly one (Mammalia) or two (Birds) caeca, and it may be sub-divided into two parts, known as large intestine and rectum; in the Vertebrata its hind end receives the ducts of various glands (kid- ney, generative organ', anal glands). It may in addition dis- charge other functions, , a respiratory (larvae of Ldbellulidse) or a secretory function (larva of PJO. 4-j.—Alimentary canal of a bird. Of, Ant Lion). oesophagus; Jf, crop ; JDm, proventriculus ; The paliyary glancls Hver and Km, gizzard ; D, small intestine; P, pan- creas placed in the loop of the duodenum; pancreas are to be regarded as n, liver; c the two c*ca; IT. ureter} o», growths of the alimentaiy oviduct; Ad, large intestine; Kl, cloaca. canal which have become diffe- rentiated into glands. The secretion of the salivary glands is poured into the buccal cavity, and there performs two functions—(1) it dilutes the food, (2) it has a chemical action upon it, converting the starch into sugar: they are absent in many aquatic animals and are especially developed in herbivorous animals.
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