A concise historical perspective of the area postrema structure and function.

First described by Retzius at the end of the 19th century, the structure in the posterior medulla oblongata, then named area postrema, underwent an intense investigation into its function in the decades that followed. Findings, mainly in animal studies, have partially elucidated its role as an emetic center in the central nervous system. In the second half of the 20th century, this function was associated with reports of syndromes characterized by uncontrollable nausea and vomiting related to structural damage in the area postrema, mainly in the context of demyelinating diseases. At the beginning of the 21st century, the so-called area postrema syndrome has been consolidated as a diagnostic factor in diseases related to the spectrum of neuromyelitis optica, more than 100 years after its first description.