The term ovum is usually restricted to the single female sex cell, but the term egg, in its common use to indicate a bird's egg, refers to a more complex structure, only part of which is produced in the ovary of the bird. The ovum of such an egg is a cell swollen with yolk material. The rest of the eggâe.g., the jelly mass surrounding amphibian eggs, and the shell, membranes, and egg white, or albumen, of bird eggsâis not cellular and is secreted around the ovum as it passes down the oviduct.
Cushing's disease---also known as Cushing's syndrome---and Addison's disease occur when your adrenal glands do not produce proper amounts of a hormone called cortisol.
(Also Called 'Chronic Adrenal Insufficiency'). Addisonâs disease is a disorder in which the adrenal glands--which sit on top of the kidneys--do not produce enough of the hormones cortisol and aldosterone. (Hormones are chemicals that control the function of tissues or organs.).ther causes of Addisonâs disease include: 1  injury to the adrenal glands. 2  infection, including tuberculosis, HIV/AIDS-related infections, and fungal infections. 3  cancer cells from another part of the body that have invaded the adrenal glands. 4  bleeding into the adrenal glands. 5  surgical removal of the adrenal glands.