So while one person might experience more of a forceful stream of liquid, another might feel a gushing sensation. In that three to five milliliters, you actually pack about million sperm. Blood is normally drained out of these chambers by veins with the same name. So, dorsal veins and cavernous veins.
There's two phases to ejaculation in itself. This one on the left here is flaccid. The best way to visualize that is if we did something called a transverse view. As these arterials dilate and allow lots of blood into these sinuses here, they actually fill so much that they push outward against the edges and compress the veinous drainage of the penis. These red arterials, when they're constricted, they don't actually allow much blood into the penis. What is keeping these arterials from opening up? It does that by sending signals to the blood vessels in the penis, and those signals cause those blood vessels to open up, and allow blood into the penis. Just to remind you, this would be his right leg.
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