. Text-book of normal histology: including an account of the development of the tissues and of the organs. ^-^ c -^ Longitudinal section of molar too{h of kitten : a, pulp-cavity,continued by canals {/) to apices of roots; d, dentine; e, en-amel ; c, cementum ; /, alveolar periosteum ; n, neck of tooth ;b, osseous tissue of Section of dried human toothshowing portions of enamel anddentine: a, ground-substance ofdentine; b, branching dentinal tu-bules ; c, terminal zone of tubuleswithin the enamel {d). tion as a radial striation, the dentinal tubules extend the entirethickness of the dent
. Text-book of normal histology: including an account of the development of the tissues and of the organs. ^-^ c -^ Longitudinal section of molar too{h of kitten : a, pulp-cavity,continued by canals {/) to apices of roots; d, dentine; e, en-amel ; c, cementum ; /, alveolar periosteum ; n, neck of tooth ;b, osseous tissue of Section of dried human toothshowing portions of enamel anddentine: a, ground-substance ofdentine; b, branching dentinal tu-bules ; c, terminal zone of tubuleswithin the enamel {d). tion as a radial striation, the dentinal tubules extend the entirethickness of the dentine as minute channels ; they are seen espe-cially well in sections of the dried tooth in which the canals arefilled with air. Starting from the pulp-surface with a diameter of20-26 /i, the dentinal tubules pass in a slightly wavy and spiralcourse through the dentine, to terminate in irregular clefts, theinterglobular spaces, situated at the juncture of the dentine withthe enamel or the cementum. THE DIGESTIVE TRACT. H7 The tubules give off numerous secondary canals along their course,by which means the adjacent tubules communicate ; on approachingthe enamel or the cement the tubules undergo repeated division,the resulting smaller secondary channels corresponding in theirgeneral direction with the larger canals. The marke
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