4 o 



EPITHELIAL TISSUES 



the basement membrane. The further history of these cell remnants is 

 somewhat doubtful. They are possibly resorbed or removed, and finally 

 replaced through mitotic division of adjacent cells. There is, however, 

 some evidence to show that after function they are still capable of further 



FIG. 47. GOBLET CELLS AS SEEN IN 

 A TRANSECTION OF A CRYPT OF THE 

 LARGE INTESTINE OF MAN. 

 Sections of five goblet cells are seen 



among the columnar cells which line 



the tubule. Muchematein and eosin. 



X550. 



FIG. 48. DIAGRAM SHOWING THE AR- 

 RANGEMENT OF THE COLUMNAR AND 

 GOBLET CELLS OF THE PRECEDING 

 FIGURE. 



The goblet cells are represented as 

 being empty; their unaltered basal por- 

 tions containing the nucleus are dis- 

 tinctly seen. 



growth, whereby they may regain their original form and become again 

 able to pass through the same stages of secretory activity. 



(4) Neuro-epithelium. The cells of neuro-epithelium are colum- 

 nar elements specially differentiated to form nerve end-organs. They 

 are usually elongated cells having a bulging nucleated center, their free 

 extremity either projecting beyond the epithelial surface as a bundle of 

 fine cilia or as a slender non-ciliated process which terminates within a 

 pore-like opening directly connected with the free surface. Their at- 

 tached extremity, tapering to a fine process, is in relation with the 

 terminal arborization of the axis cylinder of a nerve fiber. Neuro-epithe- 

 lium is found only in the several organs of special sense, and will be more 

 fully described as a part of these several organs. (See chapters of the 

 Eye, the Ear, the Olfactory Organ, the Tongue, and on the ISTerve End- 

 Organs.) 



