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636 DENTAL EMBRYOLOGY AND HISTOLOGY.
that these convokitions may have. They may arise from unequal cellu-
lar activity at different points ; at any rate, they are well-known charac-
teristics of the cords for the permanent Mdiich distinguish them from
the cords for the temporary teeth. The cord passes down upon the lin-
gual aspect of the temporary tooth and follows the same changes which
Fig. 360.
a.w_
Section of .Taw Eight :\ronths Hunian Foetus, showing Vertical Transverse Section of Central Incisor,
(injected: X 4()): el, onaniel; d, dentine; (//<, dental papilla or i)ulp; air, alveoliir wall ; ep, enamel
organ permanent tooth ; er, entrance to vessels it, nerve.
;
we have noted in the cord for the tem])orary tooth. It becomes bulbous
at its deepest extremity ; then it becomes invaginated by contact Avith
tlie dental ]>npilla, after which it settles deeper into the substance of the
jaw, and is finally scj)arated from the mucous membrane of the mouth.
(See Fig. "^m, cp.) It gradually becomes deeper seated, until it comes
