. Comparative anatomy. Anatomy, Comparative. THE ENDOCRINAL ORGANS 451 females from which the ovaries have been removed, the estrus which had been lost recurs. The follicular hormone, theelin, has the chemical formula and is a fatty substance, soluble in alcohol and other lipoid solvents. It is used h}TDodermically to induce puberty and menstruation. It is now sold as Theelin, Progynon, and under other names. Its use may cause abortion. One of the names for the corpus luteum hormone is progestin. Its action is antagonistic in some effects to that of theelin, for, while theelin acts a
. Comparative anatomy. Anatomy, Comparative. THE ENDOCRINAL ORGANS 451 females from which the ovaries have been removed, the estrus which had been lost recurs. The follicular hormone, theelin, has the chemical formula and is a fatty substance, soluble in alcohol and other lipoid solvents. It is used h}TDodermically to induce puberty and menstruation. It is now sold as Theelin, Progynon, and under other names. Its use may cause abortion. One of the names for the corpus luteum hormone is progestin. Its action is antagonistic in some effects to that of theelin, for, while theelin acts as a sex stimulant, progestin prepares the uterus for the reception of the ovum. In animals, experimental removal of the corpus luteum early in pregnancy causes abortion. Progestin prevents ovulation and menstruation in pregnancy. HEP. PORTAL V BILE DUCT HEPATIC A — R. SUPRARENAL VES^ ESOPHAGUS L INF PI-RENIC A. DORSAL AORTA. R. RENAL VES VENA CAVA LEFT SUPRARENAL GLANO L. KIDNEY L. SUPRARENAL VES. RENAL VESSELS SUP MESENTERIC A. ;\-Y\r-^"^— URETER SPERMATIC COVARIAN) VES(^ INF. MESENTERIC A Fig. 376.—Shows the suprarenals in relation to the kidneys as seen when the fat which normally encloses them is removed. The relations of the blood vessels which supply them are also shown. THE SUPRARENAL GLANDS Anatomy. The suprarenals or adrenals of man are two small glands, each averaging only four to five grams in weight, and each, as the names suggest, lying like a cap upon the upper end of a kidney, embedded usually in the same mass of fat. Accessory adrenals also occur not infrequently near the kidneys or the gonads. From their relation to kidneys, the adrenals were once assumed to be also excretory. Later discovery that their removal or destruction results in death has made them objects of much interest and research. The adrenal gland has a rich blood supply. Arterial blood comes from three sources, phrenic, aortic, and renal vessels, which give off respectively the superi
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