Pituitary Stalk Of The Brain, Anatomy

Description

Pituitary stalk (infundibulum) extends inferiorly from the hypothalamic median eminence at the tuber cinereum toward the hypophysis, maintaining a strict midline course between the optic chiasm anteriorly and the mammillary bodies posteriorly. Superiorly, the stalk blends with the floor of the third ventricle at the median eminence, while inferiorly it expands into the neurohypophysis (pars nervosa) and lies immediately posterior to the adenohypophysis (pars distalis). Along its length, the infundibulum carries the hypothalamo-hypophyseal tract and provides the conduit for the hypophyseal portal system, with the superior hypophyseal vessels concentrated near the median eminence and the inferior hypophyseal supply closer to the posterior lobe. A narrow corridor. The relationship of the stalk to the diaphragma sellae and the sellar cavity is emphasized, anchoring the connection between diencephalon and sella turcica. Stalk anatomy matters every time a sellar or suprasellar mass distorts midline structures, because even modest traction or compression can interrupt dopaminergic inhibition of lactotrophs (the classic stalk effect with hyperprolactinemia) or disrupt vasopressin transport with postoperative or tumor-related central diabetes insipidus. Craniopharyngioma, Rathke cleft cyst, germinoma, and lymphocytic hypophysitis all produce characteristic patterns of stalk thickening or displacement that clinicians correlate with endocrine labs and imaging. The focused lighting and uncluttered background in this illustration make the infundibulum’s continuity from median eminence to posterior pituitary easy to teach without losing the nearby landmarks that help orientation. Use this illustration in neuroendocrinology lectures on hypothalamic control of pituitary secretion, in neurosurgical teaching on transsphenoidal and extended endonasal approaches, or in journal figures discussing pituitary stalk interruption syndrome and postoperative diabetes insipidus. It also supports radiology and pathology correlations for suprasellar lesions by grounding the expected midline anatomy before distortion. Anatomical accuracy verified by SciePro's Medical Advisory Board.