This reflex is tested in a neurological exam and if present, is a sign of brain damage. Along with the "suck" and palmomental reflexes, snout is considered a frontal release sign. These reflexes are normally inhibited by frontal lobe activity in the brain, but can be "released" from inhibition if the frontal lobes are damaged. They are normally present in infancy, however, and up until about one year of age, leading to the hypothesis that they are primitive or archaic reflexes.
Frontal release signs are seen in disorders that affect the frontal lobes, such as dementias, metabolic encephalopathies, closed head injuries, and hydrocephalus. All of these disorders produce diffuse cerebral damage, usually involving many areas and systems in addition to the frontal lobes and pyramidal system, so the frontal release signs are not sufficient for a diagnosis.
Researchers from Ehime Prefectural Central Hospital, Department of Neurology report details of new studies and findings in the area of Parkinson disease.(Report)
Aug 13, 2008; Data detailed in 'Primitive reflexes distinguish vascular parkinsonism from Parkinson's disease' have been presented. According...