Development of the Digestive Canal of the American Alligator
Development of the Digestive Canal of the American Alligator
Reese Albert Moore
The book Development of the Digestive Canal of the American Alligator was written by author Reese Albert Moore Here you can read free online of Development of the Digestive Canal of the American Alligator book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Development of the Digestive Canal of the American Alligator a good or bad book?
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Since the head has now quite a reptilian form, the oral cavity, _m_, hasmore or less of the adult outline. A transverse groove near the anteriorend of the lower jaw marks off the tongue, _tn_; and the rudiments ofteeth are seen but not shown in the figure because of the lowmagnification used. The pharynx, _ph_, is a very extensive cavity that is sharply separatedfrom the mouth by a prominent transverse fold of skin, the velumpalitum, _vp_, just in front of the posterior nares, _pn_, and by a le...ssmarked fold from the base of the tongue; it is these two valves thatenable the adult alligator to open its mouth under the surface withoutgetting water into the lungs. The mouth and pharynx are lined at thisstage with a thin, stratified epithelium, which consists of a basallayer of rather tall columnar cells and one or two superficial layers offlattened cells. The pharyngeal epithelium is rather thicker than thatof the oral cavity. In the embryo from which this reconstruction was made the pharynx was indirect communication with neither the oesophagus nor the trachea, thoughthe separation in each case was by a mere membrane.
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