The frog; an introduction to anatomy, histology, and embryology / [A. Milnes Marshall].
- Arthur Milnes Marshall
- Date:
- 1888
Licence: Public Domain Mark
Credit: The frog; an introduction to anatomy, histology, and embryology / [A. Milnes Marshall]. Source: Wellcome Collection.
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![DIGESTIVE ORGANS. Turn the liver forwards, and note the stomach lying beneath its left lobe. Pass the handle of th* seeker through the mouth and down the oesophagus into the stomach. [If the specimen be a female, remove the ovaries and oviducts completely. ] 1. The Alimentary Canal. a. The oesophagus is a short wide tube leading from the buccal cavity to the stomach. b. The stomach is a wide tubular sac about an inch and a half in length : it is narrowed behind, and separated by a distinct pyloric constriction from the duodenum. Cut open the stomach longitudinally along its left hand edge, and wash out its contents : note the handle of the seeker already inserted through the mouth ; also the longitudinal folds of the mucous membrane lining the stomach, which increase the extent of its surface. c. The duodenum is the first part of the intestine, rather more than an inch in length : beyond the pylorus it is bent back so as to lie parallel to the stomach. At its further end it passes without any sharp boundary into the small intestine. d. The small intestine is a slender convoluted tube about four and a half inches long, opening at its distal end by a small orifice into the large intestine. e. The large intestine is a short straight tube about an inch and a quarter long: it is very much wider than the small'intestine, and opens behind to the exterior at the cloacal aperture. f. The cloaca in the frog is the last half inch of the large intestine, into which open the renal and genital ducts as well as the bladder: it will be described more fully when considering the urinary and reproductive organs. 2. The Liver. The liver is a large reddish-brown organ, divided into right and left lobes, connected together by a narrow bridge of liver- tissue. Of the twro lobes the left one is much the larger, and is again subdivided into two. \ \W](https://iiif.wellcomecollection.org/image/b28090287_0031.jp2/full/800%2C/0/default.jpg)
