When nerve cells in the nervous system cease to divide, they are in
g0 phase
g1 phase
g2 phase
s phase

G0 is the phase in which cells cease to undergo the S phase, G2 and mitosis. It is in this phase that cells such as neurons, fat cells, and liver cells and the majority of adult cells remain unless there is severe trauma which requires healing and tissue repair. During G0 the cell tends to its cellular job functions specific to the type of cell it is. For example neurons would simply communicate with other neurons and release neurotransmitters.