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Parturition Endocrine Control - Anatomy & Physiology (view source)
Revision as of 10:26, 17 August 2009
, 10:26, 17 August 2009→Species that depend on Placental Progesterone
=== Species that depend on Placental Progesterone===
=== Species that depend on Placental Progesterone===
in late pregnancy (Ewe,Guinea Pig,Queen,Mare)
in late pregnancy (ewe, guinea pig, queen, mare)
[[Image:Endocrine Control of Parturition 4.jpg|thumb|right|150px|The Onset of Parturition, Copyright RVC 2008]]
[[Image:Endocrine Control of Parturition 4.jpg|thumb|right|150px|The Onset of Parturition, Copyright RVC 2008]]
[[Image:Endocrine Control of Parturition 5.jpg|thumb|right|150px|The Onset of Parturition, Copyright RVC 2008]]
[[Image:Endocrine Control of Parturition 5.jpg|thumb|right|150px|The Onset of Parturition, Copyright RVC 2008]]
* As previously explained, parturition is dependent on a rise in foetal Cortisol. However, in this case, the rise in foetal cortisol leads to a decrease in '''maternal''' Progesterone.
* As previously explained, parturition is dependent on a rise in foetal Cortisol. However, in this case, the rise in foetal cortisol leads to a decrease in '''maternal''' progesterone.
* Foetal Cortisol causes upregulation of the enzymes '''17α Hydroxylase, C17-C20-lyase and Aromatase''' in order to increase the Oestrogen:Progesterone ratio.
* Foetal cortisol causes upregulation of the enzymes '''17α hydroxylase, C17-C20-lyase and aromatase''' in order to increase the oestrogen:progesterone ratio.