PATHOLOGY

Detailed explanation-1: -For some as-yet-unknown reason, nearly all of the signals from the brain to the body and vice-versa cross over on their way to and from the brain. This means that the right cerebral hemisphere primarily controls the left side of the body, and the left hemisphere primarily controls the right side.

Detailed explanation-2: -Our brains have two sides, or hemispheres. In most people, language skills are in the left side of the brain. The right side controls attention, memory, reasoning, and problem solving.

Detailed explanation-3: -The human brain is basically symmetrical, split down the middle: the right cerebral hemisphere receives sensory input from and directs movement on the left side of the body, while the left hemisphere governs corresponding functions for the right side.

Detailed explanation-4: -Most animals, including humans, have functionally lopsided brains. Some things are processed in the left hemisphere, others on the right side. While some of the differences are learned and others inherited, the spectrum of possibilities indicates something more random may be at work, too.