👉 The diasterm, also known as a diaphragm or pleural membrane, is a thin, elastic structure located between two layers of the lungs. It's made up of two parts: the outer layer and the inner layer. The outer layer is called the bronchial wall, while the inner layer is called the pericardium (also known as the effusor). The diasterm helps to seal off the airway between the bronchial wall and the peric