XXII] INTESTINE 173 



deeper part is in the submucous coat, it extends more 

 or less of the way to the upper level of the intestinal 

 glands; if it has been cut through the middle, note 

 that it appears to push aside the intestinal glands, 

 that there are no villi on it, and that its upper surface 

 is only separated from the cavity of the intestine by a 

 single layer of epithelium cells. 



b. Observe with a high power (oc. 4) 



a. The villi ; the epithelium consists of rather long 

 columnar cells, each with a hyaline border striated 

 with vertical lines (the balsam is apt to render this 

 indistinct), and oval nucleus placed at about the lower 

 third of the cell; the hyaline borders of the cells 

 frequently appear to have coalesced into a narrow 

 highly refractive band, which may be traced over the 

 whole villus. 



The mucous or goblet cells, irregularly scattered 

 among the former, sometimes abundant, sometimes 

 scanty or absent; they have an upper ovoid portion 

 which is transparent but has sharp outlines, and a lower 

 basal granular portion containing the nucleus (cp. with 

 the mucous cells, Lesson xx. 6, and Lesson xii. 

 1> b). 



The connective tissue, forming the substance of 

 the villus : this consists of a mesh work of fibres and 

 membranous cells, for the most part hidden by the 

 numerous leucocytes. 



The ' lacteal radicle ' may be visible in some of the 

 villi as a central space bounded by a fine line formed 

 by the epithelioid cells. 



