Figure 22-4. Mirror-image views of the right lung and mediastinal structures. The line of reflection of the parietal to the visceral pleura is shown as a white line around the hilus, prolonged below as the two-layered pulmonary ligament. Impressions produced by mediastinal structures have been indicated on the medial surface of the lung as they might appear in a hardened lung. (Based on Mainland and on Mainland and Gordon.) The inset shows the relationships at the hilus, including the eparterial (upper lobe) bronchus. Note that in this and in similar drawings, because the pulmonary veins contain oxygenated blood, they are shown in red; correspondingly, the pulmonary arteries are shown in blue. Click for high resolution image.