The medulla produces catecholamines and the cortex produces several steroid hormones, as depicted in the table below. The three cortical zones and part of the medulla are evident in the section of rabbit adrenal gland seen below.Ī higher magnification montage of a feline adrenal gland is available.īased on embryologic origin and type of hormones produced, the cortex and medulla are best though of as separate endocrine organs. zona glomerulosa - thin, outermost zone.The medulla is fairly homogeneous, but even when viewed a low power, three concentric zones can be distinguished in the cortex: The most distinctive feature of the adrenal is its partitioning into cortex and medulla. The organ is richly vascularized and capsular blood vessels, nerves and lymphatics penetrate along with the connective tissue septae. The adrenal gland is encased in a connective tissue capsule that extends septae into the substance of the gland. Endocrine System > Adrenal Glands Overview of Adrenal Histology
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