On the development of the enamel in the teeth of mammals : as illustrated by the various stages of growth demonstrable in the evolution of the fourth molar of a young elephant (Elephas indicus), and of the incisor teeth in the foetal calf (Bos taurus) / by George Rolleston.

  • George Rolleston
Date:
1871
Catalogue details

Licence: Public Domain Mark

Credit: On the development of the enamel in the teeth of mammals : as illustrated by the various stages of growth demonstrable in the evolution of the fourth molar of a young elephant (Elephas indicus), and of the incisor teeth in the foetal calf (Bos taurus) / by George Rolleston. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Fig. 1. Portion of left half of lower jaw of young Elephant, Elephas indicus, showing the fourth molar in course of develop- ment, and a part of the third molar, some of the denticles of which were in use, and some still within their socket. The teeth are seen from the inner side, the bony wall having been removed, and the capsule of the posterior tooth having been reflected. The dentinal pulp is coloured blue, the dentine yellow ; the vessels are represented as seen when filled with a red injection. From a preparation made by Mr. C. Robertson. a. Part of inner side of lower jaw interposed between the posterior denticles of the third and the anterior denticles of the fourth molar. bl. Part of third molar tooth. Its anterior denticles were in use ; some of its more posteriorly placed were just about to cut the gum, and the most posteriorly placed were still within the bony socket. 62. Processes of dentinal pulp, dividing to supply the denticles of third molar. c. Sac of tooth reflected and fastened out over the jaw above and below. d], d2, d:i. Capsular processes surrounding denticles. On the internal or dentinal aspect of the most anteriorly placed of these, d1, a granular deposit is observable. This deposit corresponds to a depost, gl, of similar ap- pearance, which encrusts the upper part of the cap of dentine, fl, and it represents the proximal ends of the enamel columns which have broken away from the more perfectly calcified segments which constitute the (enamel) deposit, gx, on /'. e1, e2, e3, e4, e5. Processes of the dentinal pulp passing up to form the successive denticles of which the composite molar is made up. e6. A number of processes homologous with those similarly lettered, but differing from them in having as yet formed no cap of dentine upon their exterior surface.