THE BRAIN 



131 



man stands at a counter in a bank, writing a check. His 

 regular breathing we refer to activities localized in the 

 medulla. The maintenance of his posture depends upon 

 complex reactions mediated in part by the cerebellum. 

 The writing approaches a purely cerebral performance. 



Sensory Areas. As the motor regions of the cere- 

 brum are regarded as places from which impulses take 

 their departure to affect subordinate mechanisms, so 

 there are in the cortex areas within which sensory cur- 





FIG. 33. The upper figure represents the left hemisphere from out- 

 side, that is, from the left. The lower figure shows the internal or 

 mesial aspect of the right hemisphere from the left side. Areas usually 

 claimed to possess special relations are marked as follows: H, hearing; 

 V, vision; Sm, smell; Sp, speech. 



rents are received. As the cells of the cerebrum never 

 connect directly with the fibers of skeletal muscle, so 

 the receptors of the body never connect directly with 

 the cortex. At least one relay is made on each sensory 

 path and usually more than one. We are best ac- 



