Conversation so far:
where are cell bodies located in the cns
The interneurons and cell bodies of efferent neurons all lie within the CNS while the cell bodies of afferent neurons reside in the ganglia located near the CNS.
what does the cns do
The central nervous system is so named because it integrates the received information and coordinates and influences the activity of all parts of the bodies of bilaterally symmetric animals.
what is the cns in latin
The central nervous system is called pars centralis systematis nervosi in Latin.

Question: which animals do not have the system
Self-contained rewrite: which animals do not have a central nervous system