. A dictionary of birds . nds the mucosa gives rise to two masses ofspecific nature which as Liver and Pancreas grow out of thewalls of the duodenum, and thus indicate their point of origin onlyby their respective ducts. The intestine, or gut proper, begins at the pyloric end of the DIGESTIVE SYSTEM stomach and ends at the cloaca. It may be conveniently dividedinto (1) the duodenum or first loop, (2) the ileum or narrowest andlongest portion, equivalent to both the jejunum and ileum of man,and lastly (3) the rectum, corresponding Avith his large transition from the ileum to the r
. A dictionary of birds . nds the mucosa gives rise to two masses ofspecific nature which as Liver and Pancreas grow out of thewalls of the duodenum, and thus indicate their point of origin onlyby their respective ducts. The intestine, or gut proper, begins at the pyloric end of the DIGESTIVE SYSTEM stomach and ends at the cloaca. It may be conveniently dividedinto (1) the duodenum or first loop, (2) the ileum or narrowest andlongest portion, equivalent to both the jejunum and ileum of man,and lastly (3) the rectum, corresponding Avith his large transition from the ileum to the rectum is marked by a moreor less circular valve (the ileo-csecal), so placed as to permit itscontents to pass into the caeca and rectum, but to hinder theirreturn—their passage throughout the whole intestine being aided bythe peristaltic contractions of the muscular layers of its walls. Anepithelium of cylindrical cells, forming a colourless, structurelessand soft cuticle, lines nearly the whole of the intestine, and is. Diagram of the Digestive Orgaks of a Tongue; Parotid and salivary glands; Tr. Trachea; left and rightbronchus ; Cr. Crop ; Pr. Proventriculus or glandular stomach ; g. Gizzard or muscular stomach;Py. Pylorus ; D. Duodenum; L. Liver with gall-bladder and duct; Pa. Pancreas with duct;C. Caeca ; R. Rectum ; K. Kidney with Ureter opening into the middle cloacal chamber. perforated by numerous small pores, opening upon their many parts these cells form very simj^le and sometimes tubularglands ( Lieberkiihns), and the greater portion of the walls isbeset with the villi mentioned above. These are very numerous,and are arranged in various ways—being either uniformly andthickly spread over the surface, giving it a velvety appearance, orare longer and more sparingly distributed in lines, which may bestraight or zigzag, transverse or longitudinal. Their arrangementis occasionally characteristic of different groups of birds ;
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Keywords: ., bookauthorlyde, bookcentury1800, bookdecade1890, booksubjectbirds
