Bending of the nodes happens by increasing (irreversible) of the cell number on the opposite side, not by changing the shape and the size of the cells, that is why became a thickening.
Bending ya nodes kinachotokea Kuongeza (Malena) ya idadi kiini upande kinyume, si kwa kubadilisha sura na ukubwa wa seli, Hiyo ni kwa nini Akawa thickening.