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*  The sperm are only released from the isthmus mucosa by the action of paracrine signals from an ova travelling down the oviduct.
 
*  The sperm are only released from the isthmus mucosa by the action of paracrine signals from an ova travelling down the oviduct.
 
** The formation of a Functional reservoir is a possible supporting mechanism of [[Fertilisation, Implantation and Early Embryonic Development -Fertilisation- Anatomy & Physiology|Block to polyspermy]], as only a few sperm are released from the isthmus mucosa at any one time. This results in only a few sperm being in the vicinity of the ova at a time and so in a position of fertilising the ova.
 
** The formation of a Functional reservoir is a possible supporting mechanism of [[Fertilisation, Implantation and Early Embryonic Development -Fertilisation- Anatomy & Physiology|Block to polyspermy]], as only a few sperm are released from the isthmus mucosa at any one time. This results in only a few sperm being in the vicinity of the ova at a time and so in a position of fertilising the ova.
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* The oviducts open into the uterine horn through the uterine ostium.
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* This marks the site of the uterotubal junction.
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* This junction is gradual in ruminants and pigs, but abrupt in the horse and carnivores.
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* In the horse and carnivores, the uterine ostium is located on top of a papilla, which forms a barrier against ascending infections.
    
==Function==
 
==Function==
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*A connecting tube structure between the uterus and ovary where fertilisation occurs.
 
*A connecting tube structure between the uterus and ovary where fertilisation occurs.
 
*To provide regulation check points for unfertilised oocytes.
 
*To provide regulation check points for unfertilised oocytes.
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*Thick muscularis layer divided into inner circular layer and outer longditudinal layer
 
*Thick muscularis layer divided into inner circular layer and outer longditudinal layer
 
*few mucosal folds
 
*few mucosal folds
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==Innervation==
      
==Vasculature==
 
==Vasculature==
 
*Tubal branch of the ovarian artery.
 
*Tubal branch of the ovarian artery.
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==Links==
 
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