236 



TWENTY- THIRD LE CTURE. 



once computed that our body contains nearly two and a half 

 millions of these convoluted glands. 



Considerable sudoriparous glands also surround the anus 

 (Gay). 



In the external auditory canal, these convoluted glands ac- 

 quire a shorter excretory duct, which is no longer convoluted, 

 and their secretion is fatty and brownish-yellow. These are 

 the glandulae ceruminosae. 



Let us now investigate the submucous follicles, the glandu- 

 lae sebaceae of the older anatomists. Their secretion, an es- 

 sentially fatty, thickish substance, we have already become 

 familiar with in a preceding lecture (p. 132). 



They form racemose organs (Fig. 191), which are some- 

 times smaller and more simple, sometimes more voluminous 

 and complicated in their structure. They are situated in the 



corium, and are, for the most part, 

 but by no means unexceptionally, 

 confined to the vicinity oT the hair, 

 into the sac of which (p. 37) they ex- 

 crete the tough, fat substance. We 

 also meet with smaller examples of 

 our organ connected with thick hairs, 

 and larger glands with lanugo hairs. 

 At last these open freely externally, 

 without the intermediation of a hair 

 sac. Their size varies considerably, 

 from 0.2 to 1 mm. and more. The 

 vesicles differ considerably in dimen- 

 sions and form. Young, striated 

 connective tissue here replaces the so-called membrana pro- 

 pria. 



Passing now to the gustatory organ, we have again to com- 

 bine what has been previously mentioned. Even at that 

 time (p. 141) we remarked that the posterior portion of the 

 tongue, upwards in the long known papillae circumvallatae, 

 and laterally in the subsequently rediscovered papillae foliatae, 

 contained terminal fibres of the glosso-pharyngeus serving as 



Fig. 191. — A sebaceous follicle ; 

 a, the gland vesicle ; b, the excre- 

 tory duct ; c, the sac of a lanugo 

 hair ; d, the shaft of the latter. 



