Buddha Abhidhamma - Ultimate Science - BuddhaNet

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So at the arising instant of the seventeenth citta reckoned
backward from the death-consciousness (cuti-citta), the last
kammaja-råpa is formed. This last kammaja-råpa will cease at the
dissolving instant of the death-consciousness.
Cittaja-råpa is formed till the arising instant of the cuti-citta.
This last cittaja-råpa will have lasted for a conscious-moment at
the dissolution of cuti-citta, and thus will perish in another sixteen
conscious-moments which happens almost instantly.
âhàraja-råpa is formed till the dissolving instant of the cuticitta,
because the support required for the formation of àhàrajaråpa
can be furnished by citta up to that time. So at death, that
last-formed àhàraja-råpa has lasted for only one minor-instant.
However in another fifty minor instants (råpa-lifespan – 51 minor
instants or 17 conscious-moments), that àhàraja-råpa also ceases.
Thus at the time of death, kammaja-råpa, cittaja-råpa and
ahàraja-råpa cease almost instantly. But utuja-råpa goes on
forming and dissolving till the corpse is converted into dust. A
corpse consists of only utuja-råpa.
So when a person dies and is reborn in another life, material
phenomena similarly arise starting from the instant of conception
and go on arising till the time of death.
Arising of Material Phenomena in Råpa-planes
In the råpa-plane, nose-decad, tongue-decad, body-decad, sexdecad
and àhàraja-kalàpas do not arise. At the time of opapàtikarebirth,
there arise four kammaja-kalàpas namely, eye-decad, eardecad,
heart-decad and vital-nonad. During life, however, cittajakalàpas
and utuja-kalàpas also arise.
To the Asa¤¤asatta brahmas, eye-decad, heart-decad and
sound-nonad (sadda-navaka) do not arise. Also cittaja-kalàpas do