Pyknosis. Pyknosis, or karyopyknosis, is the irreversible condensation of chromatin in the nucleus of a cell undergoing necrosis[1] or apoptosis. It is followed by karyorrhexis, or fragmentation of the nucleus. Wikipedia.
“A Neuron Dying.”
Image courtesy of https://imgur.com/gallery/LoLUzyi.
See:
Quipster 