Cross Section of the Adrenal Gland

Description

Positioned superior to the upper pole of the kidney, the suprarenal (adrenal) gland is rendered in cross section to distinguish cortex from medulla while preserving its anatomic relationship to the renal capsule and the concavity toward the medial border. A thin fibrous capsule outlines the gland, deep to which the adrenal cortex forms a broad peripheral band organized into zona glomerulosa (most superficial), zona fasciculata (thickest middle layer), and zona reticularis (inner cortical layer) surrounding a central adrenal medulla. Medially, the adrenal sits closer to the renal hilum region, while the kidney’s smooth external surface and hilar indentation orient the specimen in a sagittal-style sectional context. Layer recognition matters here because cortical and medullary disease behaves differently and is approached differently in imaging, pathology, and surgery. Cortisol-producing adenomas and hyperplasia arise from the cortex, while pheochromocytoma originates in chromaffin cells of the medulla and carries perioperative risk from catecholamine release; the ability to point to the medulla relative to the cortical zones helps explain why biochemical workups and contrast-enhanced CT or MRI protocols target different lesion characteristics. Surgeons also care about this topography during adrenalectomy, where the short central adrenal vein (right directly to the IVC, left typically to the left renal vein) and the gland’s superior relation to the kidney drive exposure and vascular control. Orientation counts. Use this illustration in endocrine anatomy and histology teaching to bridge gross cross-sectional anatomy with zonation and hormone output, and in clinical education materials on adrenal incidentaloma workup, Cushing syndrome, primary aldosteronism, and pheochromocytoma. It also fits neatly into nephrology and retroperitoneal surgery content where renal hilum landmarks help learners keep their bearings. Anatomical accuracy verified by SciePro's Medical Advisory Board.