. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. ACTIVITIES OF THE OVARY 89 The culmination of these changes in behavior, resulting in a receptive attitude toward the male, is reached at about the time when the egg is discharged from the ovary in many mammalian species. In certain other mammals the period of heat may precede the ovulatory phenomena. 5) Effects of Estrogen in Other Vertebrates. In the hen, estrogenic hor- mone causes enlargement and functional activity of the oviduct. Estrogenic
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. ACTIVITIES OF THE OVARY 89 The culmination of these changes in behavior, resulting in a receptive attitude toward the male, is reached at about the time when the egg is discharged from the ovary in many mammalian species. In certain other mammals the period of heat may precede the ovulatory phenomena. 5) Effects of Estrogen in Other Vertebrates. In the hen, estrogenic hor- mone causes enlargement and functional activity of the oviduct. Estrogenic substance, when injected into female chicks from the eighteenth to the fortieth day, causes an enlargement of the oviduct to about 48 times the natural size. Estrogen also has a profound effect upon the activities of the full-grown hen and aids in egg production (Romanoff and Romanoff, '49; Herrick, '44). Estrogen has a pronounced effect upon the oviducts of other vertebrate forms. b. Progesterone—The Hormone of the Corpus Luteum 1) Production of Progesterone. The luteinizing hormone, LH, of the an- terior lobe of the pituitary gland is concerned not only with the development. Fig. 52. Characteristic histological changes in the female reproductive tract under the influence of estrogen and progesterone. (A-C) Vaginal cyclic changes in the rat. In (A) is shown the condition of the vaginal wall in the diestrus (resting) condition; (B) shows changes in vaginal wail structure during estrus. Observe cornification of outer layer of cells; (C) shows vaginal wall tissue immediately following estrus, , during metestrus. The presence of progesterone tends to suppress the action of estrogen. (After Turner: General Endocrinology, Philadelphia, Saunders.) (D, E) Cyclic changes of the Fallo- pian tube of the human female during the reproductive cycle. In (D) is shown the mid- interval of the cycle, , at a time paralleling estrus in mammals in general: (E) shows the cellular conditio
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