Ovarian cycle

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  • Created by: Saoirse
  • Created on: 22-12-14 11:08
Follicular phase: Primordial follicle
Primary oocyte + follicle cells in clusters called egg nests. Activated by FSH+LH. Several each month but only one matures for ovulation
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Primary follicle formation
Follicular cells enlarge + divide (are now granulosa cells). Glycoprotein layer forms between granulosa and oocyte. Layer of stromal cells form to produce oestrogens
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Secondary follicles
Separates into 2 layers: theca follicular and antrium. Antrium: follicular fluid from granulosa accumulated in pockets. Inner layer of granulosa becomes corona radiata
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Tertiary (Graafian) follicle
8-10 days = single secondary oocyte. Rising LH triggers oocyte to complete meiosis 1 but stops at metaphase 2. Inner and outer follicle layers are separated by fluid, corona radiata forms a protective later around oocyte.
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Ovulation
Rupture of follicular wall + ejection of contents. Fimbrae move oocyte to uterine tube. END OF F. PHASE. meiosis 2 cont if fertilisation occurs, forms ovum + 2nd polar body
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Luteal phase
LH stimulates formation of corpus luteum formed by granulosa cells when empty tertiary follicle collapses and blood vessels rupture. Manufactures progesterone
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If fertilisation does not occur...
Corpus luteum degenerates and disintegrates, progesterone and oestrogen levels fall
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Other cards in this set

Card 2

Front

Follicular cells enlarge + divide (are now granulosa cells). Glycoprotein layer forms between granulosa and oocyte. Layer of stromal cells form to produce oestrogens

Back

Primary follicle formation

Card 3

Front

Separates into 2 layers: theca follicular and antrium. Antrium: follicular fluid from granulosa accumulated in pockets. Inner layer of granulosa becomes corona radiata

Back

Preview of the back of card 3

Card 4

Front

8-10 days = single secondary oocyte. Rising LH triggers oocyte to complete meiosis 1 but stops at metaphase 2. Inner and outer follicle layers are separated by fluid, corona radiata forms a protective later around oocyte.

Back

Preview of the back of card 4

Card 5

Front

Rupture of follicular wall + ejection of contents. Fimbrae move oocyte to uterine tube. END OF F. PHASE. meiosis 2 cont if fertilisation occurs, forms ovum + 2nd polar body

Back

Preview of the back of card 5
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