. Obstetrics for nurses. dies and is absorbed, the memhrana granulosa then separates from the theca and degenerates, while the liquor folliculi is absorbed. The cavity of the follicle then collapses and the cells of the theca proliferate to fill in what remains of it and develop a yellow pigment called lutein—the cells are now known as lutein cells. This is soon accomplished, and the lutein cells are in turn invaded by the surrounding connective tissue, so that, eventually, all trace of the follicle disappears, and in young individuals, strangely enough, no scar tissue remains to mark its loca
. Obstetrics for nurses. dies and is absorbed, the memhrana granulosa then separates from the theca and degenerates, while the liquor folliculi is absorbed. The cavity of the follicle then collapses and the cells of the theca proliferate to fill in what remains of it and develop a yellow pigment called lutein—the cells are now known as lutein cells. This is soon accomplished, and the lutein cells are in turn invaded by the surrounding connective tissue, so that, eventually, all trace of the follicle disappears, and in young individuals, strangely enough, no scar tissue remains to mark its location. During sexual, life certain follicles nearer the surface of the ovary are destined for further development and their fate is quite different. As they increase in size they approach the surface and the inclosed ovum undergoes the first of the changes which make it mature and capable of being fertilized. The growth is similar in nature to that observed in the deeper follicles, but continues far beyond the stage at. 24 TEXTBOOK OF OBSTETRICS FOR NURSES which atresia ordinarily occurs. A mature graafian follicle is ahontl.^o centimeters (V2 inch) in diameter and protrudes from the surfaceof the ovary as a shiny clear cyst. At its summit the wall becomesweakened because of an impaired blood supply and in time ruptures,expelling the ovum and the liquor folliculi into the pelvic cavity. Theresulting hole in the ovary is quickly filled with blood oozing from thetorn vessels and the process of healing has commenced. The clot isabsorbed l)y the rapidly growing lutein cells from the theca interna anda corpus luteum is formed. If the ovum which has been set free isfertilized and pregnancy ensues, the corpus luteum increases in size andpersists until after labor; but if fertilization does not take place thecorpus luteum rapidly disappears, being replaced by the connective tissuecells from the outside. In older individuals, where the circulation isnot so active, the degenerated tissu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectobstetrics, bookyear1
