Normal histology : a manual for students and practitioners / by John R. Wathen.

  • Wathen, John Roach, 1872-
Date:
[1905]
Catalogue details

Licence: In copyright

Credit: Normal histology : a manual for students and practitioners / by John R. Wathen. Source: Wellcome Collection.

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    derived from the epitlielium of tlie mouth aud is ectodermic in origin, while the dentine, dental pulp, cementum, and j)eri- cementum are of the connective-tissue type and are rneso- dermic. Morphologically the teeth represent papilla) of the mucous membrane. Fio. r>4. ’OOo < ? e°< » 0?» Vil “ *• S VoVo.^' a Sj'c’'- » A® Section of developing tooth, from embryo of rabbit: ep, epithelium of gum ; sh, epithelial cells forming outer layer of the enamel-pulp of the temporary tooth; L, similar layer belonging to the rudiment of the permanent tooth; Sr, enamel- pulp ; p, dental pulp of the tooth-cavity ; d, dentine ; v, bloodvessels; B, rudiment of second or permanent tooth; a, embryonic connective tissue of the alveolar process. (Freund.) About the seventh week of embryonal life a thickening of the e])ithelium covering the jaw occurs due to activity of the germinal epithelial layer. This thickening forms not onlv an elevation of the mucous membrane, but also sinks down into the submucosa. The ridge thus formed is known as the