. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE ALIMENTAEY TRACT. 283 two layers, one {LM) longitu- Pig^ jg- dinal, the other [TM) trans- verse. The longitudinal layer is thicker in the oesophagus, and thins as it is continued to the pyloric end of the stomach. The circular layer, on the other hand, gains in thickness ; hoth layers are of unstriated mus- cular fibre. (3) The submucous coat (Fig. i^6 A, B, and S2l) is better developed in the stomach than in any other part of the alimentary canal. It is formed of a wide-meshed, loose con- nective-tissue, which supports nu
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE ALIMENTAEY TRACT. 283 two layers, one {LM) longitu- Pig^ jg- dinal, the other [TM) trans- verse. The longitudinal layer is thicker in the oesophagus, and thins as it is continued to the pyloric end of the stomach. The circular layer, on the other hand, gains in thickness ; hoth layers are of unstriated mus- cular fibre. (3) The submucous coat (Fig. i^6 A, B, and S2l) is better developed in the stomach than in any other part of the alimentary canal. It is formed of a wide-meshed, loose con- nective-tissue, which supports numerous blood-vessels and lymphatics. Towards the mucous coat it possesses a well-differentiated Bluscularis )iiucosa, which is arranged in two layers, a longitudinal [B) and a transverse [A). (4) The mucous coat is pos- sessed of numerous tubular glands, which vary in. structure according to the part of the membrane examined. They have been the subject of much investigation (Heidenhain, Nussbaum, Partsch, Langley, and others), and are best de- scribed in three groups : those of the oesophagus, of the first part of the stomach, and of the pyloric end of the stomach respectively; between each pair of groups are transitional forms. a. [The oesophageal glands are complete tubular glands lined by a single layer of epithelium_, which very closely resemble the. The alimentary canal. A Oijeniag of large intestine into cloaca. CI Cloaca. D Small intestine. Du Duodenum. UB Urinary bladder. ^ Stomach. Mz Spleen. Oe Oesophagiis. Pu Pylorus. R Large intestine (rectum). t Junction of small and large Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ecker, Alexander, 1816-1887; Haslam, George. Oxford, Clarendon Press
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