What is adrenal gland?

Paired exocrine organs consisting of two regions cortex and medulla, differ in development, structure and function. Cortex is of three layers of distinct cell types, beneath the capsule (zona glomerulosa (mineralocorticoids) zona reticularis abuts the medulla (Sex steroids). Zona fasciculata (75% of adrenal gland, glucocorticoids) Adrenal medulla composed of chromaffin cells synthesize and secrete catecholamines (EPI 70% NE)