Infundibulum Of The Hypothalamus Of The Brainstem (Frontal View)

Description

Infundibulum (pituitary stalk) occupies the midline in this frontal (anterior) view, descending from the tuber cinereum on the inferior surface of the hypothalamus toward the superior pole of the hypophysis. Superiorly, its attachment aligns with the floor of the third ventricle, while inferiorly it narrows as it approaches the pituitary gland within the sellar region. The optic chiasm typically lies anterosuperior to the stalk, with the mammillary bodies posteroinferior, placing the infundibulum at the anatomical junction between diencephalon and the superior aspect of the brainstem. Midline anatomy, no distractions. Clinically, the stalk is a frequent site of compression or infiltration by sellar and suprasellar lesions, and the illustration supports teaching of the “stalk effect,” where interruption of hypothalamic dopaminergic inhibition can produce hyperprolactinemia even without a prolactinoma. Injury or distortion of the infundibulum during transsphenoidal surgery, or from craniopharyngioma and germinoma, correlates with central diabetes insipidus and hypopituitarism, so understanding its relationship to the third ventricle floor and adjacent suprasellar landmarks matters. The consistent frontal perspective emphasizes midline alignment and helps differentiate a true stalk-centered process from masses that arise laterally or primarily within the pituitary gland. Use this illustration in neuroanatomy and endocrine modules covering hypothalamic control of the adenohypophysis via the hypophyseal portal system, and in neurosurgical or neuroradiology teaching files that localize suprasellar pathology relative to the optic chiasm and third ventricle. It also suits atlas plates and review articles discussing pituitary stalk thickening, postoperative endocrine complications, and surgical corridors to the sellar region. Anatomical accuracy verified by SciePro's Medical Advisory Board.