480 



STUDIES IN ADVANCED PHYSIOLOGY. 



it and end on the outer surface of the conjunctiva in 

 little bulb-like terminations which float in the tears. The 

 statement of Conheim that these end bulbs actually project 

 from the cornea and float in the lachrymal fluid which con- 

 tinually bathes the cornea explains very satisfactorily the 

 extreme sensitiveness of the conjunctiva. Other observers, 

 however, deny that these end bulbs actually project above 

 the cornea, but hold that they are imbedded in the surface 

 epithelium of the cornea. Similar end bulbs occur in the 

 lips and the mouth. 



4. The touch corpuscles. The touch corpuscles are 

 probably the. most important of all the tactile end organs, 

 as they are found in large numbers in the skin of the hands 



Fig. 152. SECTION OF THE SKIN SHOWING TWO PAPILLAE, ONE CONTAINING A CAPILLARY 



LOOP O, THE OTHER CONTAINING A TACTILE CORPUSCLE. (After Biesiadecki.) 



d, entering nerve of three fibers ; /, /, three fibers cut within the corpuscle. The 

 fibrous connective tissue capsule is plainly shown. 



and toes, regions which are most frequently used as organs 

 of touch. They do, however, occur in other places such, 

 for instance, as the forearm, lips and tongue. The ex- 

 treme sensitiveness of the nipple is due to these same cor- 

 puscles. They lie in the dermis where the papillae extend 



