STRUCTURE OF GLANDS. 



24? 



face can be increased without any additional external com- 

 plexity, by a capsule or canal extended in length, and at the 

 same time rolled up or convoluted upon itself. We have an 

 example of this kind of gland in the ceruminous glands of the 

 ear (fig. 2-48, A. B), and in the sudoriparous glands (fig. 249, 

 A. B). We have only to conceive these two forms farther 

 subdivided, ramified, and the several parts connected by 

 means of vessels and cellular tissue, to have a perfect idea of 

 the most complex parenchymatous gland. The skeleton of 

 every gland is the ramified excretory duct, formed in the man- 

 ner already described, to which are attached the secreting 



/ 



blind sacs, vesicles, or tubes, connected together by cellular 

 tissue, and surrounded by net-works of capillary vessels. 



B 



Fig. 248. Glands from the meatus auditorius externus of a young fe- 

 male of eighteen. A, section of the skin, seen magnified three diameters ; 

 b, b, hairs ; c, c, superficially situated sebaceous glands ; a, a, larger and 

 more deeply seated glands, which are coloured yellow, and appear to 

 secrete the cerumen. B, a gland of this kind more highly magnified ; 

 a, <z, the tortuous canal composing the gland and passing over into the 

 excretory duct b ; c, a. small vessel, with its branches. C, a hah- of the 

 auditory passage, penetrating the epidermis at c, and at d, contained 

 within its double follicle e, e ; a, a, sebaceous follicles of the hair, with 

 their excretory ducts. 



