Latvian[edit] From an earlier abu, still dialectally attested (abi was originally the feminine/neuter dual form), from Proto-Baltic *abu, from Proto-Indo-European *a(m)-bÊ°ou, where the initial part is an old deictic pronoun or particle, reinforcing the meaning âtwo, bothâ of the second part.
Parkinson's disease is caused by the progressive impairment or deterioration of neurons (nerve cells) in an area of the brain known as the substantia nigra.When functioning normally, these neurons produce a vital brain chemical known as dopamine.arkinson's disease is caused by the progressive impairment or deterioration of neurons (nerve cells) in an area of the brain known as the substantia nigra.
Causes. In Parkinson's disease, certain nerve cells (neurons) in the brain gradually break down or die. Many of the symptoms are due to a loss of neurons that produce a chemical messenger in your brain called dopamine.When dopamine levels decrease, it causes abnormal brain activity, leading to signs of Parkinson's disease.The cause of Parkinson's disease is unknown, but several factors appear to play a role, including:Your genes. Researchers have identified specific genetic mutations that can cause Parkinson's disease, but these are uncommon except in rare cases with many family members affected by Parkinson's disease.he cause of Parkinson's disease is unknown, but several factors appear to play a role, including: Your genes. Researchers have identified specific genetic mutations that can cause Parkinson's disease, but these are uncommon except in rare cases with many family members affected by Parkinson's disease.