302 ANATOMY OF THE DOMESTIC FOWL 



of the bird. In addition to furnishing a path for fibers carrying 

 impulses from the body to the cerebrum, it furnishes a large number 

 of centers for such functions as respiration, swallowing, secretion, 

 temperature, and vasomotor and cardiac activity. 



The function of the cerebellum is principally that of coordination. 

 It brings about harmony and rhythm in muscular movements. If 

 the cerebellum be removed, the bird can no longer walk. It has 

 lost, with this removal, all power to coordinate. 



The cerebrum of the bird has no convolutions, and the gray, or 

 ganglionic, portion is thin, indicating low power of intelligence. 

 There are certain areas presiding over other functions, as motor 

 areas, sensory areas, and so on. 



A careful study of the brain of the fowl shows us that the centers 

 presiding over sight and smell are well developed. 



The olfactory bulbs are the centers of the sense of smell. 



The optic thalamus is the center of the sense of sight. 



The sympathetic nerve system transmits impulses to the invol- 

 untary muscular structure of all organs, including those of the 

 intestinal tract, the blood-vessels, and perhaps also the glands. 



