A text-book of dental histology and embryology, including laboratory directions . astudy of the development of thetooth and the hair, the similarityof their origin and structure be-comes more apparent. The first step in the develop-ment of the hair is a thickeningof the epithelium at a point, theepithelial cells multiplying andgrowing down into the connectivetissue below, so as to make atwo-layered bag or cap, the con-nective tissue growing up in theform of a cone-shaped papillainto the cavity of the cap (). The epithelial cells of theinner layer, next to the connec-tive tissue, multiply
A text-book of dental histology and embryology, including laboratory directions . astudy of the development of thetooth and the hair, the similarityof their origin and structure be-comes more apparent. The first step in the develop-ment of the hair is a thickeningof the epithelium at a point, theepithelial cells multiplying andgrowing down into the connectivetissue below, so as to make atwo-layered bag or cap, the con-nective tissue growing up in theform of a cone-shaped papillainto the cavity of the cap (). The epithelial cells of theinner layer, next to the connec-tive tissue, multiply rapidly anddevelop horny material and arepushed out from the surface ofthe skin as the shaft of the hair. Diagram to illustrate development of atooth: A, inner layer of enamel germ; B,outer layer; C, remains of intermediate cells;D, dentine; , dental lamina; E, epithelium;, enamel germ; En, enamel; F, dentalfurrow; , labiodental furrow; M, con-nective-tissue cells; O, odontoblasts: P, den-tine papilla: , reserve germ; V, blood-vessel. (Cunninghams Anatomy.) Fig. 5.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
