542 RESPIRATORY SYSTEM OF THE OX 
largest, and has the form of a three-sided pyramid with its base resting on the diaphragm. The 
cardiac lobe is prismatic and forms the posterior margin of the cardiac notch; its long axis corre- 
sponds to the fitth rib. The apical lobe of the left ling is small and pointed; its ventral margin 
Dorsal border 
Diaphragmatic 
lobe 
Cardiac lobe 
Fie. 481.—Lerr Lune or Ox; Larerar View. 
Arrows indicate interlobar fissures, 
Dorsal barder 
Apical lobe 
Cardiac impression 
Diaphragmatic lobe 
and surface 
Cardiac lobe 
Fic. 482.—Lerr Lune or Ox; Meptat View. 
1, Stem bronchus; 1’, bronchial branch for apical and cardiac lobes; 2, pulmonary artery; 3, 3,3, pulmonary veins; 
4, groove for aorta; 5, groove for esophagus. Arrows indicate interlobar fissures. 
lies on the pulmonary artery and the anterior aorta; below this the space in front of the heart 
is occupied by the apical lobe of the right lung. In some cases additional fissures partially sub- 
divide the apical lobe, and on the other hand the apical lobe of the right lung may be undivided. 
