. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. HO' Estradiol Estrone 2) The Ovary as the Normal Source of Estrogen in the Non-pregnant Female. Aside from the fact that estradiol and estrone are readily extracted from the ovary, certain experiments tend to focus attention on the ovary as an important site of estrogen production. For example, the removal of the ovaries of a normal, adult female mammal causes the accessory reproductive organs to undergo profound atrophy. The administration of app
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. HO' Estradiol Estrone 2) The Ovary as the Normal Source of Estrogen in the Non-pregnant Female. Aside from the fact that estradiol and estrone are readily extracted from the ovary, certain experiments tend to focus attention on the ovary as an important site of estrogen production. For example, the removal of the ovaries of a normal, adult female mammal causes the accessory reproductive organs to undergo profound atrophy. The administration of appropriate amounts of estrogen will restore the accessories of such a female to the con- dition normal for the resting state. (Consult Pincus, '50, in Pincus and Thimann, Chap. I.) The injection of follicle-stimulating hormone with small amounts of the luteinizing hormone into the diestrous (, sexually-resting) female with intact ovaries results in follicular development within the ovaries, accompanied by hypertrophy of the accessory reproductive organs to the full estrous condition (Nelsen and White, '41; Pincus, '50, in Pincus and Thimann). These and similar experiments point to the ovary as the main site of estrogen formation in the body of the non-pregnant female. The exact structures of the ovary responsible for estrogen elaboration are not easily determined. Estrogen is found in all parts of the ovary, but certain observations and experimental results suggest that it is formed in relation to the follicular tissues and also by the so-called interstitial tissue of the ovary. For example, when tumors occur within the thecal tissue of the egg follicle in women who have experienced the menopause, there is often an accompanying hypertrophy of the accessory organs. This relationship suggests that thecal gland tissue of the follicle may have the ability to elaborate estro- gen (Geist and Spielman, '43). On the other hand, the normal hypertrophy of the granulosa cells of the egg
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