 All right, home kids. Not only do we have to talk about where structures are in relation to each other, sometimes we have to talk about cuts in the body. In actuality, if you take a slice, if you cut a body in half, you do a section, and then you open that up, you're going to see a whole bunch of structures in there. And you can identify those structures, and we can learn a lot about their location and their overall, the way they're built, by looking at and thinking about the plane in which that section was made, the cut was made. So there are actually three different ways we can slice the human body. And being able to visualize slices is going to help you tackle some pretty challenging spatial tasks in this class. If I did any one of these slices, the section that is sliced is going to be flat, right? And yet it's a flat slice of a three-dimensional structure. So knowing the plane in which we are slicing is going to help us know what anatomical structures we might find in that plane. Okay, so here are your planes. Check this guy out. We have, I'm looking at this one, and my pen, of course, is not working, which I'm trying not to get super cranky. I don't think I'm being successful at that. What I just drew on, this plane is dividing the body into front and back. I think it's going to go crazy in a second when it decides that it is going to start writing. Maybe right now. I'm just not going to write. I'm sorry. I'm just not going to write. And instead, you are going to know that this one is dividing the body into a front half and back half, and that is the frontal or coronal plane. So if I slice the body and I end up with something that's front and something that's back, I've made a frontal section or a coronal section. The coronal makes you think of a crown or the corona of the sun. And so that's how I actually remember the plane that that section is in. I imagine myself wearing a sun hat and I'm going to do the whole bunch of sun beans coming out of my head in the coronal plane. The section that is... Oh, look, maybe it'll work now. Nobody knows. The section that divides my body into a left half and a right half was a good effort. That section is a sagittal section. So sagittal sections do right and left. The mid-sagittal section, or a median section, is right down the midline. But you can have a sagittal section that's not down the midline. It's an interesting question. If I did a sagittal section right here, is how do you know if it's mid-sagittal or sagittal? And you're going to look for clues that will tell you that, dude, that's not the midline. If you caught the heart, like a big chunk of heart in your sagittal section, you probably are not mid-sagittal. Mid-sagittal, you're probably just going to catch a little chunk of heart, not a big chunk of heart. If you catch lungs, you're not mid-sagittal. If you go right down the middle, you shouldn't catch any lungs in your mid-sagittal section. The last section here is the transverse section. That divides the body into an upper half and a lower half. Even though I couldn't write down a single thing for you, you better write down what I said. And that is like, this is a normal lecture. And so you have to take notes. And if I, in my normal lecture, have tech issues and can't write anything down for you, then you get to deal with that. Okay, I'm going to try and fix the tech issues for the last one, and we'll do body cavities.