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Follicles - Anatomy & Physiology (view source)
Revision as of 18:48, 1 December 2010
, 18:48, 1 December 2010Text replace - "[[The_Ovary_-_Ovulation_- Anatomy & Physiology" to "[[Ovulation - Anatomy & Physiology"
[[Image:Atretic Follicle.jpg|thumb|right|150px|Histological Section of the Ovary showing Characteristics of the Atretic Follicle - Courtesy of J.Bredl, Copyright RVC 2008]]
[[Image:Atretic Follicle.jpg|thumb|right|150px|Histological Section of the Ovary showing Characteristics of the Atretic Follicle - Courtesy of J.Bredl, Copyright RVC 2008]]
* Atresia is the the fate of most of the ovarian follicles as only a small number are [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulated]].
* Atresia is the the fate of most of the ovarian follicles as only a small number are [[Ovulation - Anatomy & Physiology|ovulated]].
* It may occur at any stage of follicular development from primary to tertiary follicle.
* It may occur at any stage of follicular development from primary to tertiary follicle.
* Atretic follicles are characterized by:
* Atretic follicles are characterized by:
* The dominant follicle enlarges, mainly as a result of its expanding antrum.
* The dominant follicle enlarges, mainly as a result of its expanding antrum.
* Growth of the dominant follicle is dependent on LH as the granulosa cells acquire LH receptors.
* Growth of the dominant follicle is dependent on LH as the granulosa cells acquire LH receptors.
* [[The_Ovary_-_Ovulation_- Anatomy & Physiology|Ovulation]] occurs in response to a dramatic increase in LH levels.
* [[Ovulation - Anatomy & Physiology|Ovulation]] occurs in response to a dramatic increase in LH levels.
* The role of FSH is superceeded by LH in the dominant follicle.
* The role of FSH is superceeded by LH in the dominant follicle.
* The plasma concentration of oestrogen starts to rise.
* The plasma concentration of oestrogen starts to rise.
* When plasma concentrations rise above the threshold value, it acts to enhance gonadotrophin secretion by positive feedback.
* When plasma concentrations rise above the threshold value, it acts to enhance gonadotrophin secretion by positive feedback.
* The high level of oestrogen causes the LH surge that leads to [[The_Ovary_-_Ovulation_- Anatomy & Physiology|ovulation]].
* The high level of oestrogen causes the LH surge that leads to [[Ovulation - Anatomy & Physiology|ovulation]].
[[Category:Female Reproduction]]
[[Category:Female Reproduction]]