The foramen of Magendie: a comprehensive review of its history, anatomy, pathology, and surgical approaches.

Abstract

The foramen of Magendie (FOM), or median aperture, represents a critical anatomical structure allowing cerebrospinal fluid outflow from the fourth ventricle into the cisterna magna. Since its description by François Magendie in the 19th century, its existence, embryological development, and clinical importance have been subjects of debate and refinement. This review synthesizes the historical context, developmental biology, and anatomical nuances of the FOM, alongside its involvement in congenital and acquired pathologies, particularly Blake's pouch cysts, Dandy-Walker malformations, and obstructive neoplasms. We further analyze controversies surrounding its recognition in early literature, anatomical variants including agenesis, and its surgical implications. Surgical approaches such as the telovelar and transvermian routes are compared, with emphasis on minimizing morbidity while ensuring exposure. Advances in neuroimaging and microsurgical technique have reinforced the FOM's relevance in modern neurosurgery. A comprehensive understanding of its anatomy, pathology, and historical discourse is essential for anatomists, neurosurgeons, and clinicians managing posterior fossa pathologies.