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It is very good question. Very difficult to answer. One cubic cm of cortex content about 1000 billion synapses. Nerve cell has from few hundred to 2,000,00 synapses from input side and other side also have such large number. So one cell is connected to many such cells and nervous system contents more than 1000 billion neurons. So multiply and count the number. Current flows through them. Circuits are so complicated that, probably you never know how they travel exactly. It means there route of travel. Gross connections you know but not how individual nerve is connected to others. Through these extremely complicated circuits, you get intellectual functions like thinking, reasoning, imagination and memory. Add to it you have emotions, like love, anger, hate, sympathy, selfishness, filling of sex, hunger, thrust. You see a snake (or cockroach if you are a girl.) and heart rate doubles in 5 seconds. All these things happen through complicated current flowing through nerve fibers. That is why there are so many branches in nerve cells.

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