Comparative Dental Anatomy

9781231684078: Comparative Dental Anatomy
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...of teeth varies extensively, and they are supported by the maxillaries, dentary, pterygoid bones and the mandible. The poisonous species are armed with the poison fang, which is long and sharp and grooved or is formed into a tube to inject the poison hypodermically (Fig. 35). Some poison fangs are erectile, as the Rattlesnake; others are upright and rigid, as the Cobra. They are connected by the basal opening of the tube with the poison sac, which occupies the temporal muscles when the mouth is widely distended. The tubular tooth through which the poison flows and is injected into the flesh is formed as if a conical tooth had been flattened into a thin sheet and then rolled so that the edges were brought together to form a tube, so that all the tissues are flat, even the pulp,--the inside of the tube being like the outside of the tooth, although the interior is not lined with enamel in all species. The tube opens a short distance from the point like a hypodermic needle, so that the point must be well implanted before injection can take place. These teeth are much recurved when erectile, and lie flat against the roof of the mouth in a fold of mucous tissue when not in use; they are raised by the moving backward of the lower jaw and quadrate bone, which pushes the upper maxillary forward and erects the fang when the strike is made. They are reproduced when lost by a vascular pulp situated posteriorly. In the Rattlesnake, ten reserve teeth have been found. All the viperine poisonous snakes--the Rattlesnakes, Puff-Adders, Vipers, etc.--have the poison apparatus highly specialized. The maxillary bone carries no teeth back of the poison fang. In the species having these teeth permanently erect, as the Cobra, they are also reproduced indefinitely as lost. The non-...

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Other Popular Editions of the Same Title

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