An introduction to anatomy and physiology. For the use of medical students and men of letters / By Thomas Sandwith.

  • Sandwith, Thomas
Date:
1824
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to anatomy and physiology. For the use of medical students and men of letters / By Thomas Sandwith. Source: Wellcome Collection.

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    culiar substance called whalebone. In fishes, and reptiles, there are several rows of teeth in each jaw. To return from this digres- sion the nature of our work will render often necessary; by the several motions of the lower jaw, mastication is performed. The food is chopped into pieces by its vertical movements; and the lateral and circular motions, round one i condyle, as a fixed point, effect its perfect com- minution. The lower jaw of carnivorous ani- mals is incapable of this horizontal motion; so that the complete reduction of their food is left to the solvent powers of the stomach. In the one case, Cuvier observes, the teeth may be compared to scissors; in the other, to the stones of a mill. Various contrivances are subservient to mastication. The tongue, in mammiferous animals, fulfils the office of a trowel, and, as many of our aliments are dry, in order to moisten them, glands, which resemble sponges, perpetually supplied with moisture, pour their secretions into the mouth. The parotids are sunk deep behind the ears; beneath the angles of the lower jaw are the submaxillary, and underneath the tongue are the lingual. These glands are of great size in ruminant animals. b 4-
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