Development of the Digestive Canal of the American Alligator
Development of the Digestive Canal of the American Alligator
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In our eReader you can find the full English version of the book. Read Development of the Digestive Canal of the American Alligator Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Development of the Digestive Canal of the American Alligator
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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.
What to read after Development of the Digestive Canal of the American Alligator?
You can find similar books in the "Read Also" column, or choose other free books by Reese Albert Moore to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after Development of the Digestive Canal of the American Alligator?
You can find similar books in the "Read Also" column, or choose other free books by Reese Albert Moore to read onlineMoreLess
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