The dental pulp and dentinal tubules (200X)

Image copyright: Mathias Nordvi, ARR.

At this magnification you will se the distribution of the dentinal tubules in the dentin. The tubules closest to the pulp take on a circular shape and look like black dots. Further away, where the angle between the section and the tubule is shallower, the dentinal tubules have been cut in a more longitudinal fashion.