A text-book of dental histology and embryology, including laboratory directions . wouldspring the thin plate of the alveolar process as a bow isbent, leaving a condition of stress in the tissue which willtend to spring back into its old position and drag the toothwith it. Notice the greater thickness of the membraneon the lingual as compared with the labial. Figs. 221 and226 show longitudinal sections at the border of the alveolarprocess. Notice that the fibers can be seen running throughthe entire thickness of the cementum. They are large,strong fibers and branch very little in their course.
A text-book of dental histology and embryology, including laboratory directions . wouldspring the thin plate of the alveolar process as a bow isbent, leaving a condition of stress in the tissue which willtend to spring back into its old position and drag the toothwith it. Notice the greater thickness of the membraneon the lingual as compared with the labial. Figs. 221 and226 show longitudinal sections at the border of the alveolarprocess. Notice that the fibers can be seen running throughthe entire thickness of the cementum. They are large,strong fibers and branch very little in their course. Note thebloodvessel that is shown in several of these sections, andthe way in which it gives off branches passing over the borderof the processes and toward the cementum. CHAPTER XXIII THE CELLULAR ELEMENTS OF THE PERIDENTALMEMBRANE Fibroblasts.—The fibroblasts are found everywhere betweenthe fibers which they have formed and to which they are spindle-shaped or stellate connective-tissue cells,having a more or less flattened nucleus and a body of granu- Fig. 227. Fibers and fibroblasts from transverse section of membrane: F, fibers cut trans-versely; F1, fibers cut longitudinally, showing fibroblasts. (About 80 X) lar cytoplasm, which is squeezed out into thin projectionsbetween the fibers. In sections stained with hematoxylinthe cells take the stain strongly and the fibers remain clear(Fig. 227). In this way the fibers are marked out by thecells which lie between them. The number of the fibroblasts CEMENTOBLASTS 295 in the membrane decreases with age. They are large andnumerous in the membrane of a newly erupted tooth andare comparatively small and few in the membrane aroundan old tooth. This is, however, characteristic of fibroblastsin connective tissue generally. Fig. 227 shows a small fieldtaken from the gingival portion of the membrane betweenthe teeth. The magnification is low, the photograph beingmade with a f objective. The cells are seen as little darkdot
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
