Why do the hemispheres of the brain control the body's opposite side?

Question

Please give me a short but good explanation

Answer 1

because efferent neurons (pyramidal tract) arising from motor cortex cross to opposite side either in medulla oblongata i.e. brain stem (80%) or at spinal cord entry level(10%). Remaining 10% remain uncrossed. As a result, right motor cortex controls left half of body and vice versa.

Answer 2

Ask GOD only he can answer that all others are bogus!

Answer 3

The organization of the brain is rather complex, especially the eyes.  The lens of the human eye inverts images vertically and horizontally, forming an unavoidable natural cross-over.  Therefore, to interpret images the left and right brain must sort things out.  If the brain can sort out left and right images it is a small step to sort out crossed-over signals from the limbs, etc.  Either the cross-over features of the human nervous system have survival value or at least pose no special disadvantage.