TWENTY-THIRD LECTURE. 



THE ORGANS OF SENSE.— THE SKIN; THE GUSTATORY, OL- 

 FACTORY AND AUDITORY APPARATUS. 



THE human external integument presents the apparatus of 

 feeling and touch. The tongue alone takes a further share 

 in the function of this sense. 



The course of our lectures required that we should discuss 

 the individual portions of the general protecting organ in 

 different places. We mentioned the epidermis at p. 32, the 

 corium at p. 58, the subcutaneous cellular tissue at p. 56, the 

 nails and hair at pp. 36 and 37. The tactile nerves were 

 alluded to at p. 211, the simple sensory cutaneous nerves at 

 p. 212. Additional information may also be obtained from 

 our Fig. 183. 



We will also add something here. The corium is thin- 

 nest over the eyelids, the prepuce, the glans penis and inner 

 surface of the labia majora ; it is thickest over the back, 

 the palm of the hand, the buttocks and sole of the foot, 

 which are the seat of the greatest pressure. The thickness 

 of the epidermis (p. 32J varies still more. We have already 

 mentioned that the color of the skin of Europeans is deter- 

 mined by the latter. 



That the corium is uncommonly vascular is known to 

 everybody. In it occurs a highly developed net-work of ca- 

 pillary vessels, 0.0074 to O.Oi [3 mm. broad, which send loops 

 into by far the greater proportion of the cutaneous papillae. 

 We meet with more independent portions of the vascular 

 system around the flat lobules of the panniculus adiposus, 

 the hair follicles and the bodies of the sudoriparous glands 

 (Tomsa). 



Lymphatics, which are said to possess independent parietes, 

 are abundant in the corium (Teichmann and J. Neumann), 



