Do Venn diagrams work to give a birds eye view of philosophy? Yes, words sometimes fail. I'm trying to think of analogies that fit the relation. I could say my hand holds or grasps a physical object but how do I say my neurons 'fill in the blank' a non-physical? Would the word 'pair' or 'paired with' be more neutral? The important thing is to start thinking about the relation. Neurons have the capability to manipulate non-physicals and non-physicals cannot exist without being 'fill in the blank' by neurons.
I would think of a hydrogen atom as fundamental and the DNA molecule as emergent. Anything following the DNA molecule would also be emergent such as brains and the ability to process information (using the neuron contained non-physical definition).
I did get looking at neuron tables for various species and that's interesting if you want to correlate number of total neurons to capabilities. Interesting, a honey bee has 960,000 neurons and can do things like find food and get back to it's hive without direct visual input.
So without using the word contained, let's just show it this way,
[neurons,(a non-physical)] as an irreducible unit
and do something useful with it - model time perception:
[neurons,(the past)]; physically exists in the present
[neurons,(the present)]; physically exists in the present
[neurons,(the future)]; physically exists in the present
This model shows how time perception is always in the physical present but lets us perceive a past, present and future.