 that we use in your basic biology classes. All dissections start with the external anatomy. For instance, you can see the nictitating membrane that covers the eye, the tympanic membrane, which is the eardrum, which is this disc behind the eye, the front legs, which are not webbed, and the back legs, which are webbed. You can see the nostrils from the top. And then when you cut the frog's mouth, you can also see them from the inside. Dissections will have you cut the angles of the mouth so that you can open them up wider. This one's already been cut. And then view the internal features of the mouth. For example, at the back of the throat, kind of a circular opening there is the esophagus. If you go a little bit farther towards the tongue, there's a slit, which goes to the lungs. And that's the glottis. There it is. That's the glottis. The tongue attaches to the front of the mouth. These two openings here are the eustachian tubes. And if you look to where they go to, they actually attach to the tympanic membrane. And they equalize pressure when the frog dives. There are two sets of teeth around the edge is the maxillary teeth. And you have two kind of pointy teeth here at the roof of the mouth called the vomarine teeth. Those are next to the nostrils, which you can also see from the inside. So just to recap, nostrils, eustachian tubes, esophagus, glottis, tongue, maxillary teeth, vomarine teeth, nictitating membrane, tympanic membrane.