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This drawing shows 2 things, how the two ripples come together, and how
the layer that is growing below the enamel, the dentin, affects the enamel. The dentin is the dominant tissue. Its spark is
the source of the enamel spark. As it moves it drags the enamel spark along with it, sort of like using one magnet to pull
another from under a sheet of glass. As the sparks are moving towards their meeting in the middle, the active cells are secreting
matrix (E for enamel, D for dentin) and moving away from the membrane between the two tissues (the DEJ, or dento-enamel junction).
(If you want to compare this to general biology, the dentin is the mesenchyme tissue, and where it meets the enamel is
the basement membrane.)
Optimum meeting
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