Changes

==Structure==

==Structure==

The oviduct is devided into 3 anatomical regions:

The oviduct is devided into 3 anatomical regions:

*Infundibulum –  The cranial ovarian end of the oviduct. It comprises  of numerous [[The Oviduct_-_Fimbrae_-_Anatomy_%26_Physiology|Fimbrae]] and the opening into the  oviduct tube, the ostium.

*Infundibulum –  The cranial ovarian end of the oviduct. It comprises  of numerous fimbrae and the opening into the  oviduct tube, the ostium.

*Ampulla – The longest region of the oviduct occupying more than half of its total length and also has the largest diameter. This is the site of fertilisation. It is distinguished by its many mucosal folds. The ampulla is joined to the isthmus via the Ampullary-Isthmus junction. This junction is important in the mare as it acts as a regulatory checkpoint allowing only fertilised ova to pass any further along the oviduct and into the uterus.

*Ampulla – The longest region of the oviduct occupying more than half of its total length and also has the largest diameter. This is the site of fertilisation. It is distinguished by its many mucosal folds. The ampulla is joined to the isthmus via the Ampullary-Isthmus junction. This junction is important in the mare as it acts as a regulatory checkpoint allowing only fertilised ova to pass any further along the oviduct and into the uterus.

*Isthmus – The caudal end of the oviduct joined to the uterus. The Isthmus is thicker walled than the ampulla and smaller in diameter. Its folded mucosa  forms a [[The Oviduct_-_functional reservoire_-_Anatomy_%26_Physiology|functional reservoire]] for sperm in the female tract.

*Isthmus – The caudal end of the oviduct joined to the uterus. The Isthmus is thicker walled than the ampulla and smaller in diameter. Its folded mucosa  forms a [[The Oviduct_-_functional reservoire_-_Anatomy_%26_Physiology|functional reservoire]] for sperm in the female tract.