CHAPTER XXXIV. 



TOUCH, THE TEMPERATURE SENSE, THE 

 MUSCULAR SENSE, COMMON SENSA- 

 TION, SMELL, AND TASTE. 



Nerve-Endings in the Skin. Many of the afferent 

 skin-nerves end in connection with hair-bulbs; the fine 

 hairs over most of the cutaneous surface, projecting from 

 the skin, transmit any movement impressed on them, with 



increased force, to the nerve- 

 fibres at their fixed ends. In 

 many animals, as cats, large, 

 specially tactile, hairs are de- 

 veloped on the face, and 

 these have a very rich nerve- 

 supply. Fine branches of 

 axis cylinders have also been 

 described as penetrating be- 

 tween epidermic cells and 

 ending there without termi- 

 nal organs. In or immedi- 

 ately beneath the skin several 

 peculiar forms of nerve end 

 organs have also been de- 

 scribed; they are known as 

 (1) Touch-cells; (2) Pacinian 

 corpuscles; (3) Tactile cor- 

 puscles; (4) End-bulbs. 

 The Pacinian corpuscles (Fig. 151) lie in the subcutane- 

 ous tissue of the hand and foot, and about the knee-joint; 

 but also away from the skin on branches of the solar plexus 

 (p. 172), so that it is doubtful if they are touch-organs. 



FIG. 151. A Pacinian corpuscle, 

 magnified. 



