54 

 THE DIGESTIVE SYSTEM. 



LABORATORY WORK FOR THE--'-^ WEEK. 1 1. - '<-.*) 



References : C\\ . * ^- i v<* - i o ^ 

 Points for Quiz : 



Laboratory Report : 



Due: 'JOb. 6^ 



Go to the delivery desk for (a) assigned slides, no, 114, 118 ; 

 (b) paraffin sections, 112, 113, 115 ; (c) collodion sections, 109, 116, 

 117 ; (d) sections already stained, in. 



LARGE INTESTINE. 



109. Colon. (L^A- Transection. Picric alcohol ; collodion ; 

 sections . > yw. Stain with hematoxylin and picrofuchsin. 



Compare with the sections of small intestine, noting identity of 

 structure of the coats and their general structure and relations, dif- 

 ferences in the absence of villi, greater number of c crypts of Lieber- 

 kiihn, increase in the relative number of goblet cells. 



no. Rectum. Kitten. Transection. Assigned for study. 

 ; collodion ; sections * ( .ju. Stained with 



Compare this preparation with 109, observing especially the 

 increased thickness of the muscular coats and the muscularis mu- 

 cosae, and the looser connection of the mucosa with the muscular 

 coat. 



in. Caecum. Rabbit. Blood vessels injected with carmine 

 gelatin mass ; now in clearer ; mount in balsam, rough side (mu- 

 cosa) up. Note the capillary net work and its denser arrangement 

 in small areas, rudimentary villi. 



SALIVARY GLANDS. 



112. Mucous type. Submaxillary gland. Cat. Mercuric 

 chlorid -f- 5% glacial acetic acid ( 26); paraffin ; section li /u. 

 Stain with hematoxylin and picrofuchsin. 



Study the section carefully, noting (a) the general structural 

 appearance of the gland, its lobulation, () the component acini and 



