Licence: Public Domain Mark
Credit: A manual of dental anatomy : human and comparative / by Charles S. Tomes. Source: Wellcome Collection.
Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.
27/614 (page 13)
![course. The most instructive transverse section is one cut parallel with the layers near to the dentine ; this will plainly show the successive layers passing to the right and to the left just as in the squirrel, but the yet more inclined fibres of the outer half of the enamel will be cut across Fic. 2 ('). obliquely ; for this reason the figure may be regarded as so far diagrammatic that this obliquity of cutting has been corrected, and the figure drawn from two sections, in each of which one set of fibres was parallel with the piano of the section. It is still further complicated l)y the fact (') Transverse section of dentine anil enamel of a Beaver ; in the inner lialf tlie prisms of contiguous layera cross each, other at right angles, in the outer they are parallel. Owing to the peculiarity of the direction in which the enamei fiVjres in the Beaver run, this figure has for clearness been rendered somewhat diagrammatic. It is obvious that a transverse section in order to show the decussation of suiierimposed layers clearly, must be parallel with the layers, i.e., oljliquo. But this obliquity will not be right for the outer portion in which the fibres are yet more inclined ujjwards, and being cut obliquely arc confusing in appearance. Hence in the figure this has been corrected, and the simpler outer layer drawn as though the plane of the section were really parallel to the fibres in both layers. The reader is re(|ucsteil to ignore the ]iarallel lines in the left-hiind portion of the figure, which are due to an unsuccessful atteni])t to represent what is really .seen in a single section.](https://iiif.wellcomecollection.org/image/b21932025_0027.jp2/full/800%2C/0/default.jpg)
