1839, R. Harlan, letter to the editor, J. V. C. Smith (editor), The New England Journal of Medicine, Volume 20, page 72,
These calcigerous tubes do not run in a straight line, but their general tendency is a curvature upwards, and, in addition to which, each line or tube is distinctly waved in itself.
Source: wiktionary
The cement is traversed by numerous fine calcigerous tubes continued in many parts from those of the hard dentine, but having a less regular course, which is however generally at right angles to the surface: they terminate principally in minute branches, which form a rich plexus around the calcigerous cells with which they communicate.
Source: wiktionary