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Parturition Endocrine Control - Anatomy & Physiology (view source)
Revision as of 11:33, 3 September 2008
, 11:33, 3 September 2008no edit summary
{{toplink
|backcolour =EED2EE
|linkpage =Reproductive System - Anatomy & Physiology
|linktext =Reproductive System
|maplink = Reproductive System (Content Map) - Anatomy & Physiology
|pagetype =Anatomy
|sublink1=Reproductive System - Anatomy & Physiology#Parturition
= Introduction =
|subtext1=PARTURITION
}}
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== Introduction ==
The foetus triggers the onset of parturition by initiating a cascade of complex endocrine/biochemical events. The foetal hypothalamo-pituitary-adrenal axis is obligatory for the initiation of parturition.
The foetus triggers the onset of parturition by initiating a cascade of complex endocrine/biochemical events. The foetal hypothalamo-pituitary-adrenal axis is obligatory for the initiation of parturition.
== Regulation of Prostaglandins ==
= Regulation of Prostaglandins =
* The increase in '''Oestradiol''' (bioactive oestrogen) also increases expression of '''endometrial Oxytocin receptors'''.
* The increase in '''Oestradiol''' (bioactive oestrogen) also increases expression of '''endometrial Oxytocin receptors'''.
= Regulation of Oxytocin =
== Regulation of Oxytocin ==
[[Image:Parturition Cascade.jpg|thumb|right|150px|The Parturition Cascade, Copyright RVC 2008]]
[[Image:Parturition Cascade.jpg|thumb|right|150px|The Parturition Cascade, Copyright RVC 2008]]
== Furgesson Reflex ==
=== Furgesson Reflex ===
* Neuroendocrine reflex
* Neuroendocrine reflex
=== Role of Relaxin ===
= Role of Relaxin =
* Glycoprotein hormone
* Glycoprotein hormone
* Prepares the birth canal by loosening supportive tissues so that the passage of the foetus can occur with relative ease.
* Prepares the birth canal by loosening supportive tissues so that the passage of the foetus can occur with relative ease.
== Role of Oestrodiol Elevation prior to Parturition ==
= Role of Oestrodiol Elevation prior to Parturition =
* Initiates secretory activity of the reproductive trace, particularly the [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|cervix]].
* Initiates secretory activity of the reproductive trace, particularly the [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|cervix]].
** Reduces friction, enabling the foetus to exit the reproductive tract with relative ease.
** Reduces friction, enabling the foetus to exit the reproductive tract with relative ease.
== Onset of Parturition ==
= Onset of Parturition =
== Species that depend on the Corpus Luteum to produce progesterone throughout pregnancy (Goat, Cow, Sow, Bitch) ==
=== Species that depend on the Corpus Luteum to produce progesterone throughout pregnancy (Goat, Cow, Sow, Bitch) ===
[[Image:Endocrine Control of Parturition 1.jpg|thumb|right|150px|The Onset of Parturition, Copyright RVC 2008]]
[[Image:Endocrine Control of Parturition 1.jpg|thumb|right|150px|The Onset of Parturition, Copyright RVC 2008]]
== Species that depend on Placental Progesterone in late pregnancy (Ewe,Guinea Pig,Queen,Mare) ==
=== Species that depend on Placental Progesterone 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]]