Figure 2211

Photomicrograph of human corpus luteum. a. The corpus luteum is formed from the collapsed follicle wall that contains the granulosa and theca cells. The granulosa lutein cells form a thick, folded layer around the former follicular cavity (Cav). Within the folds are cells of the theca interna (arrows). xl2. b. This photomicrograph shows the terone and estrogens. These hormones stimulate the growth and secretory activity of the lining of the uterus, the endometrium, to prepare it for the implantation of the developing zygote in the event that fertilization occurs.

The corpus luteum of menstruation is formed in the absence of fertilization

If fertilization and implantation do not occur, the corpus luteum remains active only for 14 days; in this case it is called the corpus luteum of menstruation. In the absence of human chorionic gonadotropin (hCG) and other lu-teotropins, the rate of secretion of progestogens and estrogens declines, and the corpus luteum begins to degenerate about 10 to 12 days after ovulation.

The corpus luteum degenerates and undergoes a slow involution after pregnancy or menstruation. The cells become loaded with lipid, decrease in size, and undergo au-

wall of the corpus luteum at higher magnification. The main cell mass is composed of granulosa lutein cells (GLC). These cells have a large spherical nucleus and a large amount of cytoplasm. The theca lutein cells (TLC) also have a spherical nucleus, but the cells are considerably smaller than the granulosa lutein cells. x240.

tolysis. A white scar, the co)~pus albicans, is formed as intercellular hyaline material accumulates among the degenerating cells of the former corpus luteum (Fig. 22.13). The corpus albicans sinks deeper into the ovarian cortex as it slowly disappears over a period of several months.

How To Reduce Acne Scarring

How To Reduce Acne Scarring

Acne is a name that is famous in its own right, but for all of the wrong reasons. Most teenagers know, and dread, the very word, as it so prevalently wrecks havoc on their faces throughout their adolescent years.

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