Brain

The brain is a pinkish-grey, wrinkled organ that fills the skull — looking, for all the world, like a huge walnut. It is hard to believe, from its appearance, that this ugly lump of jelly contains the mechanisms of thought, perception, will, and consciousness, that it is the seat of our personality. Its 100,000 million nerve cells, each with an average of 100,00 connections from other neurons, makes the human brain the most complicated and least understood object in the known universe. The vertebrate brain is the large anterior portion of the central nervous system . The "cranial vault" of the skull encases the brain in most vertebrates. In invertebrates, the enlarged and specialized anterior ganglion of the central nervous system is often referred to as a brain, although not all scientists regard it as a true brain.

Vertigo

Vertigo is a feeling of spinning (whirling) or falling down when there are no actual body movements. It is a symptom of a balance disorder that occurs due to disturbances caused in the inner ear balance. Vertigo may last for a few moments, several hours, or even days. Vertigo is most common in elderly people, but can affect both sexes at any age.
Vertigo is caused most often due to problems in the brain and inner ear. The most common form of vertigo is Benign Paroxysmal Positional Vertigo (BPPV).
The patient suffering from vertigo complains of a sensation of motion or spinning within stable surroundings, and it may be accompanied by loss of balance and nausea.