. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ent to the temporary teeth. 215. The first set, which appears in infancy, is calledtempo-ra-ry, or milk teeth. They are twenty in number ; tenin each jaw. Between six and fourteen years of age, the tem-porary teeth are removed, and the second set appears, calledperma-ncnt teeth. They number thirty-two, sixteen in eachjaw. 214. Where and how are the teeth formed ? Explain fig. 54. 215. Whatare the first set called ? How many in each jaw ? The second set ? Howmany in number ? ANATOMY OF THE TEETH.
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ent to the temporary teeth. 215. The first set, which appears in infancy, is calledtempo-ra-ry, or milk teeth. They are twenty in number ; tenin each jaw. Between six and fourteen years of age, the tem-porary teeth are removed, and the second set appears, calledperma-ncnt teeth. They number thirty-two, sixteen in eachjaw. 214. Where and how are the teeth formed ? Explain fig. 54. 215. Whatare the first set called ? How many in each jaw ? The second set ? Howmany in number ? ANATOMY OF THE TEETH. 107 216. The four front teeth in each jaw are called in-cisors,(cutting teeth ;) the next tooth in each side, the cuspid, (eyetooth ;) the next two, bi-cuspids, (small grinders ;) the nexttwo, molars, (grinders.) The last one on each side of thejaw is called a wisdom tooth, because it does not appear untila person is about twenty years old. The incisors, cuspids,and bicuspids, have each but one root. The molars of theupper jaw have three roots, while those of the lower jaw havebut two. Kg. Fig. 55. The permanent teeth of the upper and lower jaw. a, b, The , The cuspids, d, e, The bicuspids. /, <r, The molars, (double teeth.) h, The wis-dom teeth. Observation. The shape of the teeth in different species ofanimals is adapted to the kind of food on which they animals that feed exclusively on flesh, as the lion, havethe cuspids, or canine teeth, largely developed, and the molarshave sharp cutting points. Those animals that feed on grassand grain, as the horse and the sheep, have their molar teethmore rounded and flat on the crown. The human teeth are 216. Give the names of the permanent teeth. What teeth have but oneroot, or fang? How many roots have the molars of the upper jaw?Of the lower jaw? What is said of the shape of the teeth in differentspecies of animals ? 108 ANATOMY, PHYSIOLOGY, AND HYGIENE. adapted to feed on fruits, grain, or flesh, as
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