Setting aside the notion of determining the number of individual animals on the planet for a moment, merely determining the number of species on the Earth is challenging. Science has only been able to offer estimates thus far, and totals vary greatly.
A. A. A. Multiple sclerosis, or MS, is a long-lasting disease that can affect your brain, spinal cord, and the optic nerves in your eyes. It can cause problems with vision, balance, muscle control, and other basic body functions. The effects are often different for everyone who has the disease.
Lupus is an autoimmune disease that can affect almost any part of your body, including your joints, skin, kidneys, heart, lungs, or blood. Lupus can also affect the nervous system and brain. There are several terms doctors use to describe this: neuropsychiatric lupus (NPSLE), neurocognitive dysfunction, or central nervous system lupus (CNS lupus). The nervous system has three parts, any of which may be affected by lupus. 1  The central nervous system (CNS)âThe brain and spinal cord.