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Benign Hematologic Disorders 

Benign Hematologic Disorders
Chapter:
Benign Hematologic Disorders
Author(s):

Naseema Gangat

DOI:
10.1093/med/9780190464868.003.0037
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date: 19 October 2019

The menstrual cycle is composed of the follicular (proliferative), periovulatory, and luteal (secretory) phases. At periovulation, the mature follicle triggers a surge in luteinizing hormone level, causing ovum release and stimulating the residual ovarian follicle to transform into a corpus luteum. Circulating estrogen and progestin levels increase. A thickened, enriched endometrium develops owing to progestin secretion from the corpus luteum. Without fertilization, the corpus luteum atrophies, estrogen and progestin levels decline, follicle-stimulating hormone release is stimulated, and the endometrium sloughs.

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