. Quain's elements of anatomy . Fig. 478.—Enamel-peisms (from KoUikerJ. 350 diameters. A, fragments and single columns of the enamel, isolated by the action of hydrochloric acid. B, surface of a small fragment of enamel, showing the hexagonal ends of the prisms. It is further found, on treatment with acid, that a very thin membrane {enamelcuticle) entirely covers the enamel of unworn teeth upon its outer surface (, a). This membrane forms a protective covering to the enamel. It is of anepithelial and horny nature, and withstands prolonged boiling as well as theaction of acids and other
. Quain's elements of anatomy . Fig. 478.—Enamel-peisms (from KoUikerJ. 350 diameters. A, fragments and single columns of the enamel, isolated by the action of hydrochloric acid. B, surface of a small fragment of enamel, showing the hexagonal ends of the prisms. It is further found, on treatment with acid, that a very thin membrane {enamelcuticle) entirely covers the enamel of unworn teeth upon its outer surface (, a). This membrane forms a protective covering to the enamel. It is of anepithelial and horny nature, and withstands prolonged boiling as well as theaction of acids and other re-agents. According to Tomes, this membrane israther of the nature of cement, but without lacunse. On this supposition, how-ever, it is difficult to understand the meaning of the epithelial markings whichare produced in it after the action of nitrate of silver. The crusta petrosa or cement is the third substance whichenters into the formation of the teeth. This is a layer of true bone,slightly modified in structure, and inve
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
