246 



HITCHCOCK'S ANATOMY 



Blood in ench Lung. — The essential organs of respiration 

 are the Lungs. These are light solids, two in number, and 

 occupy nearly four fifths of the cavity of the chest. They 



Fig. 248. 



An Anterior View of the Thoracic Viscera in Situ, as shown by the Removal of their 

 Anterior Parietes. 1, Superior Lobe of the Right Lung. 2, Its Middle Lobe. 3, Its 

 Inferior Lobe. 4, 4, Lobular Fissures. 5, 5, Internal Layer of the Costal Pleura form- 

 ing the Right Side of the Anterior Mediastinum. 6, 6, The Right Diaphragmatic Por- 

 tion of the Pleura Costalis. 7, 7, The Right Pleura Costalis on the Ribs. 8, Superior 

 Lobe on the Left Lung. 9, Its Inferior Lobe. 10, 10, Interlobular Fissures. 11, The 

 Portion of the Pleura Costalis which forms the Left Side of the Anterior Mediastinum. 

 12, The Left Diaphragmatic Portion of the Pleura Costalis. 13, Left Pleura Costalis. 

 14. 14, The Middle Space between the Pleurae, known as the Anterior Mediastinum. 

 15, The Pericardium. 1G, Fibrous Partition over which the Pleurae are reflected. 17 

 The Trachea. 18, Thyroid Gland. 19, Anterior Portion of the Thyroid Cartilage. 20, 

 Primitive Carotid Artery. 21, Subclavian Vein. 22, Internal Jugular Vein. 23, Bra- 

 chio-Cephalic Vein. 24, Abdominal Aorta. 25, Xiphoid Cartilage. 



43G. "What are the Lungs? 



