Setting aside the apparent classification error of trees being categorized as non-biological...
Surely you've seen graphics of the brain before, and specific regions like the temporal lobe. Or just the convoluted texture of neural tissue in general, if you want to contrast that to tree bark or the appearance of cellulosic fibers of wood underneath that. Components or sub-structures heavily involved in memory -- such as the hippocampus -- can sometimes have a more distinct appearance.
Aside from maybe broad diagrams abstracted from the connectivity of various areas, there's probably no particularly precise and static schematic that is universally applicable to all human brains, since the activity of the latter itself can reciprocally bring about "re-wiring" or changes in structure unique to the individual. For instance, even identical twins who were standing beside each other when they observed the same the past event might structurally encode the memory about that incident via different neural configurations.
Such brushes against
multiple realizability, the philosophical view that an equivalent mental property or state can be realized by different physical arrangements or even different physical substrates (like electronic versus biological). Which has arguably stimulated additional proposals like
anomalous monism, where psychological states do indeed correspond to physical states, but not in a wholly lawful or universally reliable manner.
At the microscopic level, there's the recent novelty of single neurons that can
supposedly store a concept, all on their own -- general ideas that we use to recognize or classify specific things under. Kant would presumedly have been delighted by that -- that even the biological instantiation of mind relies on concepts for understanding.
- What makes humans intelligent? Concept neurons might hold the key
https://www.salon.com/2025/03/25/wh...gent-these-unique-neurons-might-hold-the-key/
EXCERPTS: You probably have a general understanding of the human brain: a network of nerve cells connected by synapses. [...] This means that a concept or memory or idea is the result of a distributed pattern of neural activity.
[...] Unfortunately, you may be badly out of date. As it turns out, in human brains, we also have a specialized type of cell called a concept neuron, which does what was long thought to be impossible: each of these cells encodes entire concepts, so that that single neuron fires whenever you’re exposed to a stimulus relating to that concept, or even when you think about it without an external stimulus.
This would be like having a single neuron that fires when you see a photograph of your grandmother, hear her voice, read her name or perhaps even smell her familiar perfume... (MORE - details)