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136 DENTAL HISTOLOGY AND ODERATI VE DENTISTRY.

function, the sense of touch for th(; tooth being exchisively in this
nienihrane.
The fibrous tissue of the incnibrane is of the white variety, and
may be divided into two chisses, the principal fibers and the indifferent or

Fig. lis.

Diagram of the fibers of the peridental membrane : G, gingival portion ; Al, alveolar portion ; Ap,
apical portion. (From a photograph of a .section from incisor of sheep.)

interfibrous tissue. The principal fibers may be defined as those which
spring from the cementum and are attached at their other end to the