![]() Believe it or not, an erection actually starts in your brain. Let's just clear off some of this stuff here. Before we talk about how an erection happens, let's briefly discuss why an erection happens. Let's go into the mechanisms of how this happens. Ejaculation is basically the expulsion of sperm out of the reproductive tract. The second step in our two-step process is called ejaculation. An erection is basically when the penis goes from having very littleīlood within its core, a state called flaccidity, and I'll write that out, to a state where it's filled with blood, and we call that an erection, when it's filled with blood. We do that, in males, via a two-step process. The bottom line is that sperm needs to be transported out of our bodies. Just to remind you, this would be his right leg. When we do that, we find that we see something like that. Then we're gonna look, here's an eye here, we're gonna look at his right side of his cut surface on the right side here. In this case, we're gonna cut away everything on his left side. ![]() Basically, if we were to look at this blue guy over here, and if we said this is his left side and this is his right side, we would make a cut down his midline, like so, and we would sort of cut away everything on one of the sides. I'll just show you whatĪ sagittal view is. To do this, we're gonna first look at a sagittal view of the male reproductive system. I just mean how it gets transported out of the male reproductive tract, and into the female reproductive tract, where it can hopefully fertilize an egg, and result in a pregnancy. We're gonna talk about the transport of sperm. ![]()
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