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'4' constrictions on ureter

chuinhen
in Anatomy, Physiology and Neuroscience

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normally we study that there is 3 constrictions in the ureter

that is at:

 

1) ureteropelvic junction

 

2) when ureter passes pelvic brim

 

3) when it opens into the urinary bladder

 

 

 

but i heard from an unknown source that there is a 4th constriction

when it crosses the external iliac artery ...

 

is it true ??

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