That's what causes the penis to get engorged. These lacuner spaces run the entire length of these vascular chambers, so there are a lot of spaces there for blood to leak out into. When the penis is filling with blood, blood actually leaks out of these cavernosal arteries and into these purple circles that you see called lacunar spaces. Here's a dorsal artery, and here's a cavernosal artery here. Blood normally flows into these vascular chambers via both dorsal arteries and cavernosal arteries. Also, this structure here in the center, this tube, is the urethra. By the way, this is the bottom of the penis, the underside, and this is the top of the penis. These vascular compartments, or chambers, are called the corpora cavernosae, and you have two of those, one on each side here, and the corpus spongiosum, which you have down here. Vascular compartments that get filled withīlood during an erection. In this view, it's quite easy to see the three cylindrical You can see the veins have been compressed to the sides. Over on the right we have an engorged, erect penis.

You can tell because it's got a lot more visible blue veins, which you don't see in erection. The one on the left is a flaccid penis, It's not filled with blood. Just to orient you, this transverse view is of two different penises, side by side. When we do that, you'll find that it looks something like this. We'll put our little eye here and we'll look up at this cut surface here. Transverse view is basically a cut that goes this way across the penis. The best way to visualize that is if we did something called a transverse view. What we'll do next is look at a more detailed view of the anatomy of the inside of the penis. This area here is called the head, or, the glans. The base of the penis, here, that's called the base, or the root. First, we'll talk about some regional anatomy of the penis. So it's this filling of the penis with blood which results in an erection. 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. When you're physically or mentally sexually stimulated by sights or sounds, or smells, or even thoughts, your brain sends signals to your penis, and it can cause an erection. 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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