Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . ke its appear-ance until long after the rest, and hence it is called thewisdom-tooth. 146. The human teeth are composed of three distinct Describe each. How many sets of teeth are there ? How many teeth arethere in the first set ? How many in the second ? When does the last mo-Jar make its appearance ? Of what are the human teeth composed? 70 CLASS-BOOK OF PHYSIOLOGY. structures—the ivory or tooth-bone,
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . ke its appear-ance until long after the rest, and hence it is called thewisdom-tooth. 146. The human teeth are composed of three distinct Describe each. How many sets of teeth are there ? How many teeth arethere in the first set ? How many in the second ? When does the last mo-Jar make its appearance ? Of what are the human teeth composed? 70 CLASS-BOOK OF PHYSIOLOGY. structures—the ivory or tooth-bone, the enamel, and thecementum. The ivory, which constitutes the main part ofof the tooth, resembles bone in its structure, except it con-tains a larger amount of mineral matter, and is harderthan bone. The enamel forms a crust over the whole sur-face of the crown of the tooth, and protects it from wear-ing out or decaying. It is composed of ninety-eight partsin a hundred of mineral matter, and is the hardest of allanimal substances. The cementum forms a covering tothe root of the tooth, and serves to make its attachmentin the jaw more firm. Fig. 24 represents a section of ahuman
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectphysiologicalprocess
