. Animal physiology. Physiology, Comparative; Physiology, Comparative. 156 DEGLUTITION OR SWALLOWING. by artificial means, the next best remedy is to cut the food into very small portions, before it is taken into the mouth, and to masticate it there as thoroughly as possible. Deglutition. 192. In the Mammalia, the cavity of the mouth is guarded behind by a sort of movable curtain, which is known as the veil of the palate (Fig. 105) ; and this hangs down during mastica- tion, in such a manner as to prevent any of the food from pass- ing backwards. This partition, which does not exist in Birds a
. Animal physiology. Physiology, Comparative; Physiology, Comparative. 156 DEGLUTITION OR SWALLOWING. by artificial means, the next best remedy is to cut the food into very small portions, before it is taken into the mouth, and to masticate it there as thoroughly as possible. Deglutition. 192. In the Mammalia, the cavity of the mouth is guarded behind by a sort of movable curtain, which is known as the veil of the palate (Fig. 105) ; and this hangs down during mastica- tion, in such a manner as to prevent any of the food from pass- ing backwards. This partition, which does not exist in Birds and other animals that do not masticate their food, hangs from the arch and sides of the palate, so as to touch the tongue by its lower border; but it can be lifted in such a manner as to give the food free passage beneath it, into the top of the gullet. When mastication is completed, the food is collected on the back Veil of the palate Nose Pharynx I §§|flf|f|f|i'] ;'. - -., - afi§| Tongue ¥__ "*" Salivary glands Os hyoides 1 l/IV'— ? Larynx Thyroid gland Oesophagus Trachea Fig. 105.—Perpendicular Section of the Mouth and Throat. of the tongue into a kind of ball; and this, being carried back- wards by the action of its muscles, presses against the partition just mentioned, and causes it to open. The food thus passes. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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