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PERIDENTAL MEMBRANE. 137
bone of the alveolar wall, to the outer layer of the periosteum covering
the surface of the alveolar process, to the cenientum of the approximating
Fig. 119.
Longitudinal section of peridental membrane from j'oung sheep, sliowing fibers penetrating
cementum: D, dentin; C\ cementum, showing imbedded fibers; F, fibers running to outer
layer of periosteum covering the alveolar process ; F', fibers running to the bone at the i)order
of the process ; B, bone. (About 80 X.)
tooth, or become blended with the fibrous mat of the gum supporting
the epithelium. They were so called by Dr. Black, not only because
