THE NERVOUS SYSTEM 103 



at the bottom. Behind the same fissure lies an area of 

 nearly like size and shape which receives and interprets 

 those sensations communicated from the periphery, like 

 pain, pressure, heat and cold, which were discussed with 

 the skin. Around the end of the Sylvian fissure is an 

 angular area concerned in word and object seeing. Just 

 below the same fissure lies the center for hearing and 

 one still lower for the interpretation of words. In the 



Fig. 24. Cortical centers in man. Of the three shaded areas bordering on 

 the Rolandic fissure (hoi.), the most anterior is the precentral associational 

 area, the middle one is the motor area (the position of the body areas are 

 indicated on it), and the ma,st posterior is the sensory area, to the cells of 

 which the fillet fibers proceed. The centers for seeing and hearing are also 

 shown. The unshaded portion in front cf the Rolandic area is the precentral; 

 the portions behind, the parietal and temperosphenoidal. (Pearce-Macleod, 

 Fundamentals of Human Physiology.) 



occipital lobe is the center for vision, while the centers 

 for smelling and tasting, closely associated, appear to 

 be on the inner surface of the temporosphenoidal lobe 

 near its anterior end. A glance at the surface of the 

 brain, or a good picture of the cortex, will show how 

 small a surface is employed in the functions of motion 



