Manual of human histology . ftparts it is usually irregular, and is frequently marked withannular striations. The cement is the least hard of the threedental tissues, and is, chemically, almost identical with Bibra found: In Man. In the Ox. Organic matters 29*42 32-24 Inorganic matters 70-58 67-76 100-00 10000 The latter, thus composed • THE TEETH. 55 Phosphate of lime and fluoride of calciiitu .... 58-73 Carbonate of lime 7-22 Phosphate of magnesia 0-99 Salts 0-82 Cartilage 31-31 Fat 0-93 10000 The earthy salts are readily extracted from the cementby acids, a white cartilage remainin
Manual of human histology . ftparts it is usually irregular, and is frequently marked withannular striations. The cement is the least hard of the threedental tissues, and is, chemically, almost identical with Bibra found: In Man. In the Ox. Organic matters 29*42 32-24 Inorganic matters 70-58 67-76 100-00 10000 The latter, thus composed • THE TEETH. 55 Phosphate of lime and fluoride of calciiitu .... 58-73 Carbonate of lime 7-22 Phosphate of magnesia 0-99 Salts 0-82 Cartilage 31-31 Fat 0-93 10000 The earthy salts are readily extracted from the cementby acids, a white cartilage remaining, which may easily beseparated from the dentine, and usually, when boiled, yieldsgelatin. Like bone, the cement consists of matrix and of lacwKS, butrarely contains Haversian canals and vessels. Besides these,peculiar canals analogous to those of the dentine are found, andother more abnormal cavities. The matrix is sometimes granular, sometimes transverselystriated, sometimes amorphous, and frequently laminated Fig. ih. , Jw ^ />. // like bone. The lacunce resemble in all essential charactersthose of the bones, so that any detailed description may bedispensed with. They are distinguished only by the greatvariety which they present in number, form, and size (0-005—0-02, even to 0-03), and the unusual number and length(as much as 0-03) of their canaliculi. The majority are oval. Fig. 192. Dentine and cement from the middle of the fang of an incisor tooth :a, dentinal canals; i, interglobular spaces, having the appearance of osseous lacuna ;e, smaller interglobular spaces; d, commencement of the cement, with many canalsclose together; e, its lamellce; f, facunce; g, \s; x 350. From Man. 56 SPECIAL HISTOLOGY. and lie parallel to the axis of the tooth, others are roundedand pyriform. Those are most remarkable which have avery elongated form, together with a narrow, canal-like cavity(fig. 185), inasmuch as their resemblance to the dentinal canalsis unraistakeable.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
