Identifier: 101515363X2.nlm.nih.gov
Title: Human physiology (Volume 2)
Year: 1844 (1840s)
Authors: Dunglison, Robley, 1798-1869
Subjects: Physiological Processes Physiology
Publisher: Philadelphia : Lea and Blanchard
Contributing Library: U.S. National Library of Medicine
Digitizing Sponsor: Open Knowledge Commons, U.S. National Library of Medicine

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he corresponding permanent ones have not beenformed. , The following are the periods at which the permanent teethgenerally make their appearance. They are extremely irregular,however, in this respect: the estimate must, consequently, be re-garded as a general approximation only. Anterior or first great molares, - Middle incisors, Lateral incisors, - Anterior bicuspids, or first lesser molares,Posterior bicuspids, or second lesser molares,Canine teeth, ------ Second great molares, - - - - Third great molares or dentes sapiential, When these have all appeared, the set is complete, consisting ofthirty-two teeth, sixteen in each jaw,— the number of temporaryteeth having been onlv twenty. Fig. 284 represents the uppei analower permanent teeth in their alveoli or sockets, the externalalveolar plate having been removed to show the mode in wlucn 6£ years.68910 11 or 12 12 or 1317 to 20 524 AGES. they are articulated. Fig. 285 represents the same teeth whenremoved from the socket. Fig. 285.
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g e d e f Upper and lower Teeth,a, a. Central incisors, b, b.Lateral incisors, c, c. Canine teethc, e. Second bicuspidati. /,/. First molares. g,g. Second molares,dentes sapienlite. d, d. First bicuspidati.h, h. Third molares or While the jaws are becoming furnished with teeth and increasingin size, they undergo a change of form, and the branches becomemore vertical, so as to favour the exertion of force^during mastica*tion. When the teeth issue from the gums, they are most favour-ably situate for the act of mastication ; the incisors are sharp, thecanine pointed, and the molares studded with conical asperities;but, in the progress of age, they become worn on the surfaces,which come in constant contact. During the occurrence of these changes, which embrace thewhole of the period we are considering, and extend, at times, intothe two next, the animal functions, especially that of sensibility,become surprisingly developed, and the intellectual and moral re-sults of a well adapted system

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