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DR Medhat MRCP

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Adrenal(supra-renal) glands<br />

Anatomy :<br />

- They are retroperitoneal endocrine glands that sit at the top of the kidneys (RT &LT).<br />

- The right adrenal gland is triangular shaped, while the left adrenal gland is semilunar.<br />

- Histologically , each gland is formed of outer cortex & inner medulla.<br />

Outer cortex : has 3 zones<br />

‣ Z. glomerulosa : secretes miniralocorticoids eg Aldosterone (under ++ of<br />

angiotensin II).<br />

‣ Z.fasciculata : secretes glucocorticoids e.g Cortisol ( under ACTH ++)<br />

‣ Z. reticularis : secretes adrenal androgens.<br />

Inner medulla : secretes adrenaline & nor-adrenaline (catecholamines)(under ++<br />

of splanchnic nerves).<br />

Physiology :

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