Cells arranged in ovoid groups without a significant lumen. Component cells are columnar with spherical, deeply staining nuclei. Richly supplied with blood. The zona glomerulosa secretes hormones concerned primarily with mineral metabolism. The mineralocorticoids are deoxycorticosterone and aldosterone.
Sinusoids arise from multiple arterioles in the capsule.
Course between cell cords. Cells are regularly arranged in parallel cords, one to two cells thick. Component cells are cuboidal, frequently containing two vesicular nuclei. Vacuoles seen in some cells represent dissolved lipid droplets. Cholesterol is chiefly present in this zone.