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.
While it is not clear what events cause the abnormal nerve function linked to Parkinson's disease, there are certain conditions and medications that can cause Parkinson's disease-like symptoms. These include: 1  Certain medications. 2  Certain drugs such as antipsychotics used to treat severe paranoia and schizophrenia can cause a person to experience symptoms that resemble Parkinson's disease (Parkinsonism).