Quain's elements of anatomy . -Enamel-peisms (from KollikerJ. 350 diameters. A, fragments and single columns of the enamel, isolated by the action of hjdrochloric acid. B, surface of a small fragment of enamel, showing the hexagonal ends of the piisms. It is further found, on treatment with acid, that a very thin (cnamdcuticle) entirely covers the enamel of unworn teeth upon its outer sui-face (, a). This membrane forms a protective covering to the enamel. It is of anepithelial and horny natiu-e, and withstands prolonged boiling as well as theaction of acids and other re-ag
Quain's elements of anatomy . -Enamel-peisms (from KollikerJ. 350 diameters. A, fragments and single columns of the enamel, isolated by the action of hjdrochloric acid. B, surface of a small fragment of enamel, showing the hexagonal ends of the piisms. It is further found, on treatment with acid, that a very thin (cnamdcuticle) entirely covers the enamel of unworn teeth upon its outer sui-face (, a). This membrane forms a protective covering to the enamel. It is of anepithelial and horny natiu-e, 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 lacuna. 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 investing
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
