. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. li I >H ] jSf' m 40 HIGH SCHOOL ZOOLOOY. or peritoneal lining by means of a double fold thereof, known as the mesentery. If, as in most animals the intestinal canal bo longer than the cu3loni, it is evident that the mesentery must be longer along the line of its intestinal attachment than along that where it is continuous with the ccclomic lining. If then the intestine be thrown into coils, so as to be accommodated with- in the ccelom, the mesentery must likewise be complicated in its form. Between th
. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. li I >H ] jSf' m 40 HIGH SCHOOL ZOOLOOY. or peritoneal lining by means of a double fold thereof, known as the mesentery. If, as in most animals the intestinal canal bo longer than the cu3loni, it is evident that the mesentery must be longer along the line of its intestinal attachment than along that where it is continuous with the ccclomic lining. If then the intestine be thrown into coils, so as to be accommodated with- in the ccelom, the mesentery must likewise be complicated in its form. Between the two folds of the mesentery the blood-vessels and nerves which pass to and from the intestine are accom- modated. Immediately within the serous coat of the intestine is the muscular coat, in which two layers are recognized, an outer of longitudinal, and an inner of circular fibres. These fibres are of the involuntary order, except in the oesophagus where the inner circular is wanting and the longitudinal fibres are surrounded by voluntary or striped fibres. Within the muscular coat we find more or less subnmcous tissue, answering to the subcutaneous tissue of the skin, and finally the mucous coat which forms the lining of the intestine, and in which, as in the skin, we recognize two layers, a con- nective-tissue and an epithelial. The latter is the characteristic tissue of the intestine, and forms the bulk of those glands which contribute the various digestive juices. (Fig. 16). 51. Although there is no marked boundary l)etween the stomach and cosophagus, the former is decidedly wider, and much more abundantly Fig. Section of supplied with blood. This is neces- Intestinal Wall of Catfish. ^^^.^ ^^^ ^^^ ^^^^^ discharge of the Ep, epithelium; m, mucosa; i . i , im, longitudinal nius* function of the gastnc glands, tubes cle&. m. Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
