And we have the inner membrane of our pleura known as the visceral pleura. So the parietal pleura actually connects our lungs to outside organs of our body. For example, our ribcage and our visceral pleura actually connect to our two lungs. Now, in between the two pleura, we actually have a space. And this space, this cavity, is known as the intraplural space, or the pleural cavity. And this cavity contains a special liquid, a special fluid known as the pleura fluid.