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Okay guys, so now we are going to study the ovarian cycle and the uterine cycle

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And as you can see in this picture, we need to study both cycles together

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Because they are connected to each other

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So that means that the things that happen during the ovarian cycle have an effect in the uterine cycle

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both cycles last 28 days

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And we are going to study one by one. So we are going to start with the ovarian cycle

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As I said, it lasts 28 days more or less and

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It's divided in three phases. The follicular phase, the ovulation and the luteal phase

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So remember that the ovaries produce

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The ova, that is what we have here, and also the female sex hormone, the estrogen and progesterone

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Okay

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So at the beginning of this cycle, during the follicular phase, this hormone that is the follicle-stimulating hormone

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That is produced by the pituitary gland, stimulates the growth of the follicle in the ovaries

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And produces estrogens, that we have them here. We can see the levels how they increase

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Okay, so during the follicular phase

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this hormone

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Stimulates the growth of the follicle that inside we have the ovum and also produces

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estrogens

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Later we have the ovulation that is one day event

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and

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Consists of the release of an ovum

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That we have here. So this ovum goes to the fallopian tubes

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This ovum is released thanks to this hormone, the LH, that is the

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luteinizing hormone that is produced by the

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hypothesis

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And this hormone is the one that triggers the ovulation

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Okay, and then we pass to the luteal phase

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So once the ovum is released

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The follicle, that is what we have here, is

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transformed into

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a mass of cell that is what we call the corpus luteum

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This corpus luteum

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produces

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progesterone

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We can see the blue line here

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And this hormone is involved in the uterine cycle too, the same as the estrogens

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So

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after 10 or 12 days

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the corpus luteum

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degenerates and stops secreting hormones and a new cycle starts