Assertion: testicular vein's valve | /r/CapableOf | help prevent retrograde flow of blood
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text: Similarly, considering that the TVs contain valves which help prevent retrograde flow of blood, absent or defective valves will subsequently lead to an increase in the pressure within the spermatic veins , as it happens for the compression of the LRV between the aorta and the mesenteric superior artery (nutcracker phenomenon) .