refers to a highly vascularized region of the brain, which is located on the basal wall of the lateral ventricle. Brain capillaries in this area form a relatively permeable part of the blood-brain barrier. This enables the passage of toxic substances to the underlying chomoreceplor trigger zone, which elicits a vomiting response, in response to the detection of a noxious substance.
AREA POSTREMA: “The area postrema represents a permeable area of the blood-brain barrier that promotes vomiting when toxic substances are detected. “