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* In species with '''inguinal mammary glands''' (cow,ewe,goat,mare), the main blood supply is from the '''external pudendal artery'''.  This arises indirectly from the external iliac artery via the femoral artery. The external pudendal artery passes through the inguinal canal.
 
* In species with '''inguinal mammary glands''' (cow,ewe,goat,mare), the main blood supply is from the '''external pudendal artery'''.  This arises indirectly from the external iliac artery via the femoral artery. The external pudendal artery passes through the inguinal canal.
** Due to the extensive blood supply in the cow, there is also a small contribution from the internal pudendal artery which is a branch of the internal iliac atery.  Also, the external pudendal artery has a sigmoid flexure to permit the artery to stretch when the udder is full of milk.
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** Due to the extensive blood supply in the cow, there is also a small contribution from the '''internal pudendal artery''' which is a branch of the internal iliac atery.  Also, the external pudendal artery has a sigmoid flexure to permit the artery to stretch when the udder is full of milk.
 
* In species which also have '''thoracic mammary glands''' (bitch,queen,sow) blood supply is from the '''internal thoracic artery''' and its branches - cranial and cranial superficial epigastric arteries.
 
* In species which also have '''thoracic mammary glands''' (bitch,queen,sow) blood supply is from the '''internal thoracic artery''' and its branches - cranial and cranial superficial epigastric arteries.
  
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