What is the term for the surface of the lower lung that rests on the diaphragm?

The term for the surface of the lower lung that rests on the diaphragm is indeed "Base." The base of the lungs is broad and flat, allowing it to sit comfortably on the convex surface of the diaphragm, which is a dome-shaped muscle that plays a critical role in respiration. This anatomical relationship enables effective expansion and contraction of the lungs during breathing.

In contrast, the apex refers to the topmost portion of the lungs, which is located near the collarbone. The lateral surface pertains to the side areas of the lungs, which are positioned toward the outer side of the thoracic cavity. The medial surface is the aspect of the lung facing the mediastinum, the central compartment of the thoracic cavity, where structures such as the heart and trachea are located. Understanding these terms is crucial for anyone working in oncology data, as it relates to thoracic anatomy, which can be relevant in treatment planning and diagnostic imaging.