Osmosis video - Adrenal gland histology

Adrenal gland histology is the study of the microscopic structures of tissues of the adrenal gland. The adrenal gland is a small, triangular-shaped organ that sits on top of each kidney. It has two parts: the cortex and the medulla.

The cortex is made up of three layers: the zona glomerulosa, the zona fasciculata, and the zona reticularis. The medulla contains sympathetic nerve cells that release adrenaline (epinephrine) and noradrenaline (norepinephrine) into the bloodstream.