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 & Symptoms. Parkinsonâs disease is caused by damage to a special kind of nerve cells (neurons) in a specific part of the brain that produce a chemical called dopamine. Dopamine sends messages throughout the body that help control movement. In people with Parkinsonâs, these neurons produce less and less dopamine. As a result, controlling movement and carrying out other tasks gets increasingly difficult. The cause of the damage to these neurons is not known.