AND PHYSIOLOGY. 



247 



are of a conical shape, the apex pointing upwards, the base 

 resting on the Diaphragm, of a pinkish gray color, frequently 

 clotted with black spots, and divided by a deep fissure into 

 two lobes. The right lung is shorter in its Ions; diameter 

 than the left, on account of the liver which raises the right 

 side of the diaphragm higher than the left. The right lung 

 is subdivided again, so that it is really made up of three lobes 

 instead of two. It has also a larger capacity than the left, 

 since the position of the heart, considerably upon the left 

 side of the median line of the body, occupies a portion of the 

 left thorax. Each of the lung3 ordinarily contains a pint of 

 blood. 



437. Lobules of tlie Lungs, — A closer examination of the 

 lungs shows them to be made up of small bodies called Lung- 

 lets. These are from th to j^th. of an inch in diameter, and 

 of a conical or pyramidal shape. They are much more clearly 

 denned in small children than in adults. Fig. 249, by the 



Fig. 249. 

 f f f 



e 



A Lunglet with a Section of a Bronchial Tube, a, Bronchus. 7? and c, Vessels of 

 Bronchial Lining Membrane. <7, d, e, e, Spaces between contiguous Lobules, contain- 

 ing the Terminal Pulmonary Arteries and Veins supplying the Capillary Plexus {/, /,) 

 to the Meshes of which the air gains access by the Lobular Passages. 



Give their shape, color and division. What are the lobes of the lun-s ? Which is the 

 largest lung, and why the difference ? 437. How are the lungs made up? At wliat pe- 

 riod of life can the kinglets be best seen ? 



II* 



