Definition of Progressive supranuclear palsy:

Progressive supranuclear palsy is a movement disorder that occurs from damage to certain nerve cells in the brain.

Causes, incidence, and risk factors:

Progressive supranuclear palsy is a condition that causes symptoms similar to those of Parkinson's disease.

It involves damage to many cells of the brain. Many areas are affected, including the part of the brainstem where cells that control eye movement are located. Also affected is an area of the brain that controls steadiness when you walk. The frontal lobes of the brain are also affected, leading to personality changes.

The cause of the damage to the brain cells is unknown. The disease gets worse over time.

People with this condition have deposits in brain tissues that look like those found in patients with Alzheimer's disease. There is a loss of tissue in most areas of the brain and in some parts of the spinal cord.

The disorder is most often seen in people over 60 years old, and is somewhat more common in men.