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I learn about the brain right now, and there are crossing of neuron pathways everywhere; in the thalamus, the medulla oblongata, the pyramidal tract... And I don't understand why? What is the reason to connect - for example - the right foot to the left part of your brain?

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Possible duplicate: Here and especially here. –  Remi.b Apr 6 at 20:41

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Crossing or decussation is a lot more robust against wiring errors than their seemingly simpler same-sided wiring counterparts. See here for the research carried out to establish this and for more detail.

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