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CHAPTER 22: THE REPRODUCTIVE SYSTEMS

V.THE FEMALE REPRODUCTIVE SYSTEM

A.Organs (continued)

1.Ovary (continued)

d.Maturation of Follicle: See Fig 22.26, page 904.

During child bearing years, each month FSH stimulates one primordial follicle to mature:  The following events occur over a 14 day period (approximately).

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.

e.Ovulation:See Fig 22.26, page 904.

Oogenesis (meiosis I) is complete as the follicle matures (approximately 14 days);

Upon maturation, Luteinizing hormone (LH) causes the follicle to burst, releasing an secondary oocyte

See Fig 22.25, page 903.

After ovulation, the oocyte is drawn into the fallopian tube (via fimbriae).

See Fig 22.26, page 904.

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