Image from page 192 of "A text-book of dental histology and embryology, including laboratory directions" (1912)
Authors: Noyes, Frederick Bogue
Publisher: Philadelphia and New York, Lea & Febiger
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress
View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.
Text Appearing Before Image:
gt; | . --. v-._ • * ■ ■ AWl-U-M lllllllill • //■ . - ^*j /^M^fcf A section showing compound curves near the dento-enamel junction. (About 80 X ) The Dentinal Tubules in the Root Portion.—In the rootportion of the dentine the tubules ordinarily show only thesecondary curves, their general direction being at right anglesto the axis of the pulp canal. Throughout their course theygive off an enormous number of very fine branches extendingfrom tubule to tubule. These are so numerous that insuitably prepared sections they may be said to look like theinterlacing twigs of a thicket or the rootlets of plants in thesoil. Fig. 137 gives a very good idea of the appearance. At the dentocemental junction the tubules end in irregular DENTINAL TUBULES IN THE ROOT PORTION 175 anastomosing spaces, which cause the appearance of thegranular layer of Tomes (Fig. 138). From a consideration of the preceding it will be seen thatit is usually not difficult to determine whether a field of Fig. 136
Text Appearing After Image:
Dentine at dento-enamel junction, showing tubules cut longitudinally: Dt, dentinaltubules; D, dentine matrix. (About 760 X) dentine seen under the microscope was taken from the crownor the root of a tooth. The structural characteristics of thetwo regions may be summarized as follows: In the crown,the tubules show both the primary and the secondary curves. 176 THE DENTINE In the root, the tubules show only the secondary curves.In the crown, the lateral branches are few and inconspicuousand the tubules branch in a characteristic way at the dento-enamel junction. In the root, the lateral branches are very Fig. 137
Note About Images
Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.