"In both the brain-first and body-first scenarios the pathology arises in structures ... with Parkinson's primarily stems from olfactory nerves in the brain or nerves in the gut.

Dr Thais Mauad, lead author of the study and associate professor of pathology at the University ... study can get into the brain through the olfactory nerve. Mauad said, ‘We thought that if ...

Lepousez studied olfactory sensory perception and its health ... In the mouth, it is strongly expressed in the nerve endings of the trigeminal nerve, which innervates the oral and nasal cavities.