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V.THE FEMALE REPRODUCTIVE SYSTEM

B.

Hormonal Control of Female Reproductive Functions

See Fig 22.32, page 909 and Table 22.3, page 909.

1.Secretion of Gonadotropins:

The female body remains reproductively immature until about eight years of age when secretion of gonadotropins (FSH and LH) from the anterior pituitary gland increases.  (What gland causes the anterior pitituary to secrete these?)

a.

FSH causes maturation of a follicle

FSH is secreted from Day 0 through 14 of the female cycle and causes the following events to occur:

1.  The primary oocyte enlarges and undergoes meiosis I ;

2.  The follicular cells multiply and give rise to stratified epithelium composed of granulosa cells;

3.A layer called the zona pellucida appears and separates the oocyte from the granulosa cells.

The follicle is now called a primary follicle.

4.A fluid-filled cavity, called the antrum appears.

A crown of granulosa cells surround the oocyte (corona radiata).

The follicle is now called a secondary follicle.

See Fig 22.23, page 902.

b.

LH causes ovulation.

A  surge of LH on day 14 of the female cycle causes:

The secondary oocyte to be released into a fallopian tube and

The follicle becomes the corpus luteum..

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