Principles of human physiology / by William B. Carpenter.

  • William Benjamin Carpenter
Date:
1869
Catalogue details

Licence: Public Domain Mark

Credit: Principles of human physiology / by William B. Carpenter. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    84/1110 (page 50)
    CONNECTIVE TISSUES—TEETH. intervening between the tubuli is clear and homogeneous, and in soft- ened specimens gives evidence of being deposited in lamellae, concentric with the pulp-cavity (Sharpey). Near the outer surface of the dentine, Fio. 25. Section through the fang of a Molar Tooth :—a, a, dentine traversed by its tubuli; b, b, nodular layer ; c, c, cementum. and also forming certain arched contour lines at the crown of the tooth, is a peculiar modification of the matrix, which appears to be cleft into spaces bounded by globular masses perforated with dentinal tubuli^ the so-called interglobular layer. The enamel (Fig. 2G) is composed of solid hexagonal prisms of about the 1-5000th of an inch in diameter, arranged vertically to the dentinal surface on which they rest, and firmly adherent to one an- °- other. The course of these prisms is generally wavy, and their surfaces, in sec- tion, are marked by trans- verse strise. Enamel is the hardest of all the tissues o the body. The crusta petrosa, or cementum, corresponds in all essential particular with bone, possessing it' characteristic lacuna? an canaliculi. It is destituteJ however, of any lamellar] structure. It is thickest atj the extremity of the fang, and becomes gradually thinner towards tha neck of the tooth, where it terminates. The following are the results of Von Bibra's analysis of the component structures of human teeth:—| a Transverse section of Enamel, showing the hexagonal form of its priBtns ; b, separated prisms. Organic matter Earthy matter Incisors of Adult Man. Dentine. 28-70 . 71-30 . 10000 Enamel. 3-59 96-41 100-00 Cementum. 29-27 70-73 100-00