190 



MUCOUS MEMBRANES 



Convoluted tubular glands occur as the sweat glands of the skin, 

 the ceruminous glands of the ear, and the glands of Moll in the 

 eyelids. The above are typical simple coiled glands. Certain 



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FIG. 172. FROM THE LARGE INTESTINE OF MAN. 



Showing simple tubular glands in longitudinal section at a, and in transverse and oblique 

 section at 6. Hematein and eosin. Photo, x 48. 



other glands, which are less typically coiled but are more or 

 less convoluted near their blind extremities and are frequently 

 branched, are also to be included under this type. Such glands 

 are the pyloric glands of the stomach, and the small mucous glands 

 of the oral and nasal cavities, pharynx, larynx, trachea, bronchi, 

 and esophagus. Some of these glands, and especially those of 

 the pyloric end of the stomach, present terminal acinar dilata- 

 tions, hence they also resemble to some extent a small tubulo- 

 acinar type of gland. 



The typical coil glands consist of a duct whose epithelium 

 resembles an attenuated layer of the stratified epithelium upon 

 which they open, and a fundus or secreting portion which is lined 

 by columnar epithelium of the glandular type. They also possess 



