File:The comparative anatomy of the domesticated animals (1873) (17945055952).jpg

Title: The comparative anatomy of the domesticated animals
Identifier: ags9990.0001.001.umich.edu
Year: 1873 (1870s)
Authors: Chauveau, Auguste, 1827-1917; Arloing, Saturnin, 1846-1911; Fleming, George, 1833-1901. tr
Subjects: Veterinary anatomy
Publisher: New York. D. Appleton and company
Contributing Library: University of Michigan
Digitizing Sponsor: University of Michigan

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362 THE DIGESTIVE APPARATUS IN MAMMALIA, After their complete eruption from the alveolar cavities, the Dog*s teeth are no longer pushed outwards. They are remarkable for their brilliant whiteness, which they owe to the absence of cement on their covering of enamel. The Cat has thirty teeth: twelve incisors, four tusks, and fourteen molars, eight of which are in the upper, and six in the lower jaw. All these teeth are constructed on the same type as those of the Dog. The tusks are deeply striated on their external surface, instead of being smooth. (The importance of a correct knowledge of the period of eruption, shedding, replacing, and general wear of the teeth of the domesticated animals, as a guide to their age, induces me to give the table on page 363 (from Leyh), as indicating at a glance the age at which the teeth appear, are shed, and replaced in the different creatures : Baumeister divides the successive evolutions in the wear of the tables of the Horse's incisor teeth into four periods—from six years to extreme old age. The first, the trans- versely-oval period, extends from six to twelve years ; the round, from twelve to eighteen years; the triangular, from eighteen to twenty-four years, and the antero- posterior oval or triangular, from twenty-four years and upwards. Girard and other French authorities shorten these periods somewhat. The triangular period, for instance, only lasts from fourteen to seventeen years.) COMPARISON OP THE MOUTH OF MAN WITH THAT OP ANIMALS. The brevity of Man^s face influences the shape of the mouth; therefore it is propor- tionally shorter and wider than in the domesticated mammals. Fig. 168.
Text Appearing After Image:
MEDIAN ANTERO-POSTERIOR SECTION OF THE HUMAN FACE. a, Septum of nose, with section of hard palate below it; 6, Tongue; c. Section of soft palate; d, d, Lips; m. Uvula; r. Anterior arch, or pillar of fauces; 2, Pos- terior arch; t, Tonsil; p, Pharynx; h, Hyoid bone ; k, Thyroid cartilage , n, Cricoid cartilage; s, Epiglottis ; ??, Glottis; 1, Posterior opening of nares; 3, Isthmus faucium; 4, Superior opening of larynx; 5, Passage into oesophagus; 6, Orifice of right Eustachian tube.

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