. Text-book of normal histology: including an account of the development of the tissues and of the organs. lying within the dentinal tubules. The pulp consists of a matrix of softembryonal connective tissue, in which nu-merous stellate and spindle cells form pro-toplasmic net-works JDy their anastomosingprocesses. At the periphery the connective-tissue elements are arranged as layers ofelongated cylindrical cells perpendicular tothe inner surface of the dentine, in contactwith which they lie ; these cells are theodontoblasts, being the representatives of the cells which wereactively engaged in
. Text-book of normal histology: including an account of the development of the tissues and of the organs. lying within the dentinal tubules. The pulp consists of a matrix of softembryonal connective tissue, in which nu-merous stellate and spindle cells form pro-toplasmic net-works JDy their anastomosingprocesses. At the periphery the connective-tissue elements are arranged as layers ofelongated cylindrical cells perpendicular tothe inner surface of the dentine, in contactwith which they lie ; these cells are theodontoblasts, being the representatives of the cells which wereactively engaged in producing the dentinal matrix. The protoplasmof many of these cells is prolonged peripherally as delicate threadsinto the dentinal tubules, the processes becoming modified to form thestiff elastic dentinal fibres ; centrally, the odontoblasts frequentlyare connected with the stellate connective-tissue cells. The pulp is richly supplied with blood-vessels and nerves. Thearteries run in the long axis of the tooth, breaking up into capillarynet-works which are closest in the periphery. The nerves accom-. Section of human tooihjunction of the dentine and thecementum: D, dentine with itstubules, which communicate withinterglobular spaces {B i and withlacunae of cementum (C). THE DIGESTIVE TRACT. 149 Fig. 178. pany the larger blood-vessels as meduUated fibres ; these give offfilaments which pass to the layers of odontoblasts, among whichthey extend as pale fibres. The ulti-mate distribution of these latter is stillunsettled ; the assertion that fine fibrillaeaccompany the dentinal fibres into thetubules lacks confirmation. Distinct lymphatic vessels havenot been demonstrated within the pulp,although the clefts within the matrixbetween the connective-tissue fibresrepresent the lymph-spaces and are inclose relation with the adjacent lym-phatic channels. DEVELOPMENT OF THE TEETH.
Size: 1184px × 2110px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiajblipp
