INNERVATION OF THE HUMAN SKIN 



221 



cold spots and pairs of warmth spots marked " local 

 sign " is found. This Goldscheider showed to be higher 

 for cold than warmth spots. 



Cold Spots. Warmth Spots. 



Do. 2 mm. 



Do. 5.0 mm. 

 Do. 3 mm. 



Palm 



.8 mm. 



Cheek, Chin and 





forehead 



0.8 mm. 



Upper arm 



2 mm. 



Back of hand, leg, 





thigh 



3 mm. 



Forearm 



3 mm. 



Back, chest, abdo- 





men 



2 mm. 



Do. 

 Do. 



4 mm. 

 3 mm. 



Do. 5 mm. 



Thus on the palm of the hand two pairs of cold spots .8 mm. 

 apart are distinguished by this punctiform stimulation, 

 whereas on this surface two pairs of warmth spots are 

 only distinguished when they are 2 mm. apart on the 

 cheek, chin or forehead and cold spots are distinguished 

 when .8 mm. apart on the same surfaces warmth spots 

 when 5 mm. apart. 



Table VI. — Average lowest distances in millimetres on different 

 areas of skin where two points are felt as two or minimal 

 distances from which double sensation is obtained. 



Skin Region. Adult Man. 



Boy aged Twelve. 



Tip of tongue 



1.1 



1.1 



Palmar surface of tip of 







finger (index) 



2.3 



17 



Red surface of lip 



4.5 



3.9 



Palmar surface of 2nd 







phalanx of finger 



4.5 



3.9 



Dorsal surface of 3rd phalanx 







of finger 



6.8 



4.5 



Side of tongue 



9.0 



6.8 



Tongue 27 mm. from tip 



9.0 



6.8 



Plantar surface of distal 







phalanx of great toe . . 



11.3 



6.8 



Surface of palm of hand 



11.3 



9.0 



Dorsal surface 2nd phalanx 







of finger 



11.3 



9.0 



Forehead 



22.6 



18.0 



Back of ankle 



22.6 



20.3 



Back of hand 



31.6 



22.6 



