Median Eminence Of The Brain, Sagittal View

Description

Median eminence and adjacent hypothalamic landmarks are presented in a mid-sagittal relationship at the ventral floor of the third ventricle. Superiorly, the ependymal lining of the third ventricle meets the tuber cinereum, while inferiorly the median eminence blends into the infundibulum (pituitary stalk) directed toward the hypophysis. Anterior to this region, the optic chiasm and lamina terminalis area provide orientation; posteriorly, the mammillary bodies mark the transition toward the posterior hypothalamus. Midline anatomy is the point. Neuroendocrine signaling converges here because the median eminence contains the primary capillary plexus of the hypophyseal portal system, where parvocellular hypothalamic neurons release factors such as CRH, TRH, GnRH, and GHRH that regulate the adenohypophysis. The fixed sagittal perspective supports teaching of the third ventricular floor boundaries that matter during transsphenoidal and extended endonasal approaches, when traction or thermal injury near the infundibulum can contribute to postoperative diabetes insipidus or hypothalamic dysregulation. Lesions that distort this region, including suprasellar craniopharyngioma, hypothalamic glioma, or inflammatory hypophysitis, are easier to contextualize when the median eminence is seen relative to the optic apparatus and mammillary bodies. Use this illustration for hypothalamus and pituitary modules in neuroanatomy, neuroendocrinology, and neurosurgical anatomy courses, and for publisher figures explaining the hypophyseal portal circulation or the floor of the third ventricle in midline pathology. Anatomical accuracy verified by SciePro's Medical Advisory Board.