. The comparative anatomy of the domesticated animals. Veterinary anatomy. Fig. SECTION OF THE INCISOR TOOTH OF A HORSE, SHOWING THE ARRANGEMENT OF ITS DIF- FERENT SUBSTANCES. I, Dentine ; E, enamel; 0, ce- ment. other hand we possess incisors unworn, or nearly so, in which the cavity is almost entirely filled by the crusta petrosa. We are not aware that, up to the present time, any account has been taken of these differences when calculating the progress of wear; but it may be imagined that they ought to influence in a sensible manner the period at which effacement of the external denta
. The comparative anatomy of the domesticated animals. Veterinary anatomy. Fig. SECTION OF THE INCISOR TOOTH OF A HORSE, SHOWING THE ARRANGEMENT OF ITS DIF- FERENT SUBSTANCES. I, Dentine ; E, enamel; 0, ce- ment. other hand we possess incisors unworn, or nearly so, in which the cavity is almost entirely filled by the crusta petrosa. We are not aware that, up to the present time, any account has been taken of these differences when calculating the progress of wear; but it may be imagined that they ought to influence in a sensible manner the period at which effacement of the external dental cavity takes place. All the characteristics just indicated belong to the deciduous teeth (Fig. 232, 5), except that they are smaller than the permanent ; that they are of a shining milky-white colour, due to the thinness or absence of the crusta petrosa ; that they show at the point of union between the free portion and the root, a constriction named the neck; that their crown is finely striated, and not cannular, on the anterior face ; that the external cul-de-sac (wfun- dibulum) is shallow ; and that they are not constantly pushed outwards from their cavities, their growth ceasing when they begin to be used. When the replacing teeth appear, they do so a little behind the temporary ones, the shedding of which they cause by gradually destroying their roots, these at last becoming only a long and very thin shell of dentine. The follicle in which the incisor teeth are developed shows only two papillae DENTITION OF THE INFERIOR JAW OF THE HORSE, THE TEETH SEEN ON THEIR TABLES. Consult Fig. 38 for the dentition of the upper 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 Chauveau, A. (Auguste), 1827-1917; Arloing, S. (Saturnin), 1846-1911; Fleming, George, 1833-1901. New York, D. Appleton
Size: 1316px × 1897px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorchauveauaauguste18271, bookcentury1800, bookdecade1890
