Hypophysis Of The Brain

Description

Hypophysis (pituitary gland) occupies the hypophyseal fossa of the sphenoid bone, seated within the sella turcica beneath the diaphragma sellae. The anterior lobe (adenohypophysis) forms the larger, more glandular portion, positioned anteroinferior to the posterior lobe (neurohypophysis), which lies posteroinferior and continues superiorly as the infundibulum (pituitary stalk). Superior to the gland, the suprasellar cistern region and the expected position of the optic chiasm provide key spatial context; laterally, the cavernous sinuses and cavernous segment of the internal carotid arteries frame the sellar compartment. Small organ, big consequences. Sellar anatomy matters because millimeters decide symptoms and surgical risk. Pituitary macroadenomas typically expand superiorly through the diaphragma sellae toward the optic chiasm, producing bitemporal hemianopia, while lateral extension into the cavernous sinus threatens cranial nerves III, IV, V1, V2, and VI and can complicate resection. The separation of adenohypophysis from neurohypophysis in a fixed, sectional perspective supports endocrine teaching by keeping the functional dichotomy visible: hormone-producing anterior lobe versus hypothalamic projections terminating in the posterior lobe, with the infundibulum as the conduit for hypophyseal portal and neural pathways. Use this illustration in neuroanatomy and endocrinology coursework when introducing the hypothalamo-hypophyseal axis and sellar relations, and in radiology or neurosurgical teaching to orient MRI/CT correlations for transsphenoidal approaches to pituitary tumors. It also suits textbooks and patient-education materials discussing pituitary adenoma, apoplexy, or postoperative complications such as CSF leak and diabetes insipidus. Anatomical accuracy verified by SciePro's Medical Advisory Board.