Buddha Abhidhamma - Ultimate Science - BuddhaNet

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So far, i.e. up to the third causal relation, we have seen that
avijjà (ignorance) conditions the arising of various kammas, which
in turn condition the arising of 32 lokiya-vipàka cittas and 18
kammaja-råpas. The 32 lokiya-vipàka cittas, in their turn, condition
the arising of 35 cetasikas, i.e. three mental groups.
Since vipàka cittas represent vi¤¤àõakkhandha, and kammaja
råpas represent råpakkhandha, we now have all the five groups of
existence for the new embryo to manifest itself as a living being.
It should be noted, however, that only the 4 mental groups
arise in Aråpa-planes, only the corporeality group in the mindless
(Asa¤¤a)-plane, and all the five groups in Kàma- and Råpa-planes.
4 Nàma-råpa-paccayà Saëàyatanaü
Nàma-råpa conditions saëàyatana to arise, or in other words,
saëàyatana arises as a consequence of nàma-råpa.
Nàma-råpa here means the 35 cetasikas (three nàmakkhandhas)
which associate with the 32 lokiya-vipàka cittas, and 18 kammajaråpas
as stated in the third causal relation.
Saëàyatana refers to the six ajjhattikàyàtanas (six internal
bases) namely, cakkhàyatana, sotàyatana, ghànàyatana, jivhàyatana,
kàyàyatana and manàyatana. The first five ayatanas represent the
five pasàda-råpas which are present in 18 kammaja-råpas.
Manàyatana here represents only the 32 lokiya-vipàka cittas as we
are describing the causal relations.
We have seen in the third causal relation that 35 cetasikas
arise as a consequence of the 32 lokiya-vipàka cittas. Now we see
that the 35 cetasikas re-condition the arising of the 32 lokiya-vipàka
cittas. This illustrates a¤¤a-ma¤¤a-paccaya (condition by way of
mutuality) between cittas and cetasikas.