Plasma Membrane

Primary oocytes are present in the ovary at birth.

About once a month 6-12 primary oocytes begin to mature.

A primary oocyte and its surrounding cells constitute a follicle.

"Some mammals have ovarian cycles shorter than 28 days; others have longer ones. Rats and mice have ovarian cycles of about 4 days; many seasonally breeding mammals have only one ovarian cycle per year.

Primary oocytes are present in the ovary at birth.

Plasma Membrane Primary Oocyte

Ligament (holds ovary in place in body)

The developing oocyte is nourished by surrounding follicular cells, which also produce estrogen.

About once a month 6-12 primary oocytes begin to mature.

A primary oocyte and its surrounding cells constitute a follicle.

200 |im

After 1 week, usually only one primary oocyte (2n) continues to develop. A meiotic division just before ovulation creates the secondary oocyte (n).

Ligament (holds ovary in place in body)

The developing oocyte is nourished by surrounding follicular cells, which also produce estrogen.

200 |im

After 1 week, usually only one primary oocyte (2n) continues to develop. A meiotic division just before ovulation creates the secondary oocyte (n).

43.12 The Ovarian Cycle The ovarian cycle progresses from the development of a follicle to ovulation and finally to growth and degeneration of the corpus luteum.The micrograph shows a mature mammalian follicle; the oocyte is in the center.

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