Each portion is specialized in the production of particular hormonal steroids.
The cortical portion (also called the adrenal cortex) is made up of three successively layered portions. Each layer has a different origin, structure and function. Both the right and left adrenal glands receive blood from numerous blood vessels coming from the diaphragm, kidney vessels and aorta.Īdrenal glands have two layers: the cortex and the medulla. It has a single adrenal vein that empties into the renal vein.
The left gland sits next to the aorta (the artery that takes blood from the heart and transports it to other areas of the body), colon, stomach and spleen. The right gland sits next to the inferior vena cava (the vein that carries blood from the legs and abdomen back to the heart) and typically has one adrenal vein that empties directly into it. They resemble a triangular shape and have a yellowish-brown color. They are about 5cm long and 2.5 cm wide and weigh about 5 grams each. The adrenal glands are two small glands, one located on the upper end of each kidney.
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