. The comparative anatomy of the domesticated animals. Veterinary anatomy. 358 THE DIGESTIVE APPASATUS IN J Free border border ox's INCISOR TOOTH. portion, externtil face, outer ; a', If)idj internal face, outer ; b. Root; u. Neck; /, Anterior border; g, g' Inner border. stituting the root, and separated from one another by a very marked constrictionâthe. neck. This arrangement gives to the tooth the form of a shovel, the root representing the handle (fig. 163). "The free portion, flattened above and below, and thinnest and widest towards its anterior extremity, presents two fa
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 358 THE DIGESTIVE APPASATUS IN J Free border border ox's INCISOR TOOTH. portion, externtil face, outer ; a', If)idj internal face, outer ; b. Root; u. Neck; /, Anterior border; g, g' Inner border. stituting the root, and separated from one another by a very marked constrictionâthe. neck. This arrangement gives to the tooth the form of a shovel, the root representing the handle (fig. 163). "The free portion, flattened above and below, and thinnest and widest towards its anterior extremity, presents two facesâan inferior or external, the other superior or internal; with tliree borders, an anterior and two lateral. 'â Tlie external face, slightly convex, and milk-white in colour, is covered with fine, undulating, longitudinal strise, which disappear with age, and leave the surface beautifully polished (fig. 163, a). " The internal face, flatter than the pre- ceding, presents in its middle a slight conical eminence, whose base widens anil is terminated near the free extremity of the tooth, while its sides are circiunscribed towards each border by a well-defined groove (fig. 163, a'). "The two lateral borders (the internal slightly convex in its length, the external slightly concave in the same direction) make the free portion appear as if thrown outwards. The anterior border is sharp, and slightly con- vex from one side to the other; it is the first part of the tooth destroyed by wear. '.' The root is rounded, slightly conical, and implanted in an alveolus of the same form; in youth, it shows at its extremity an opening communicating with an internal cavity analo- gous to that in the teeth of Solipeds, and pro- longed into the interior of the free portion (flg. 163, b). " In the virgin tooth, the enamel forms around the free portion a continuous layer, thinnest on the internal surface, and extending very scantily over a part of the root. " The dentine compos
Size: 1456px × 1716px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorchauveauaauguste18271, bookcentury1800, bookdecade1880
