— 9t — 



Observe tliat in tlu' pyloric glands the duct is longer, 

 the secreting tuhule correspondingly shorter, jiiid lined by 

 only one kind of cells, these resembling the chief cells in 

 the cardiac glands. The section may show small masses 

 of adenoifl tissue in the dee[)er ])()rti()n of the mucosa. 

 Sketch as al)Ove directcul. 



(e) Section of the Pyloric End of the Stomach 



and Small Intestine, Showing Brunner's 

 Glands. 



A piece of the riitcstiiial canal, iiu'Iiiilin<,' the juiictinn of the 

 pyloric end of tlie stoinacli and the small intestine, was removed 

 from a eat, pinned out on a flat enrU, hardened in aljsointe alcoiiol, 

 stained in borax carmine, emliedded in pai-afiin, and so cut as to 

 include holh iiyhnic end and small intestine in the section. Fix to 

 the slide, ami nmniit in halsam. 



Study under low ]»o\ver. The ]Kn-tion of the section 

 from the pyloric end will show the structure above 

 described. In the portion from the small intestine, 

 observe the villi and the cryjtts of Lieberkiihn in the 

 mucosa, and Brunner's glands in the submucosa. The 

 latter are compound tubular glands with the secreting 

 tubules in the submucosa. They are grouped about the 

 ends of the long duets which pass up through the muscu- 

 laris mucosa and mucosa, opening in the depressions 

 between the villi. In the cat the secretion of these glands 

 is mucous. Sketch a portion of the snuiU intestine show- 

 ing Brunner's glands as seen under low power. 



(f) Small Intestine. 



Small ])ieces from the small intestine of a do<r were hardened 

 in mercuric chlo>ide, stained in Delafield's luematt)xylin, embedded 

 in paraffin, and cross-sectioned. Fix sections to the slide, and 

 mount in balsam. 



Study first under low power. Note the villi, conical 

 projections of the mucosa, covered by a single layer of 

 columnar cells. Observe the chyle vessel in the center of 

 each villus. In the mucosa are found man\' tubular 

 glands, the cryjjts of Lieberkiihn, coming to the surface 

 between the villi. The mucosa is bounded below by a 

 muscularis mucosa composed of two or three layers of non- 



