Final answer:
The membrane that covers the thoracic wall and the superior portion of the diaphragm is called the parietal pleura.
Step-by-step explanation:
The membrane that covers the thoracic wall and the superior portion of the diaphragm is called the parietal pleura. It is a serous membrane that lines the chest cavity and covers the outer surface of the lungs. The pleural membrane helps to reduce friction during breathing and creates a sealed compartment for the lungs.