202 now BODY CONTROL IS BROUGHT ABOUT 



of acts and of things. These areas have to do with our voluntary 

 actions, for the stored memories are really stored sensory impres- 

 sions. Voluntary acts, then, are the cornpletion of reflexes. Even 



Thinking, abstract 

 concenfraHon, 

 making decisions 



-'Motor area 

 Sensory area 



'Thinking, /earning, 

 understanding 



Visualarea 

 CodrdinaHon 



Loealization of functions in the biain. 



reasoning may be explained as the association of concepts, the 

 relation of which is not close. Beasoning is perceiving relation- 

 ships in seemingly unrelated facts. 



The Sense Organs of Man. Touch, Temperature, Pressure, 

 Pain. — In man, the nervous mechanism which receives touch 

 stimulations is located in the folds of the dermis or true skin. 

 Special nerve endings, called the tactile corpuscles, are found there, 

 each inclosed in a sheath or capsule of connective tissue. Inside 

 is a complicated nerve ending, from which axons pass inward to 

 the central nervous system. The number of tactile corpuscles 

 present in a given area of the skin determines the accuracy and 

 ease with which objects may be recognized by touch. The feeling 

 of temperature, pressure, and pain is determined by different end 

 organs in the skin. Two other kinds of nerve endings exist in the 

 skin, which give distinct sensations of heat and cold. These nerve 

 endings can be located by careful experimentation. There are 

 also areas of nerve endings which are sensitive to pressure, and 

 still others, most numerous of all, sensitive to pain. 



Taste. — The surface of the tongue is folded into a number of 

 little projections known as papiVloe. In the folds between these 

 projections, on the top and back part of the tongue, are located 

 the organs of taste. These organs are called taste buds. 



