49 

 THE DIGESTIVE SYSTEM. 



LABORATORY WORK FOR THE WEEK. 



References : 

 Points for Quiz : 

 Laboratory Report : 



Due . 



Go to the delivery desk for {a) assigned slide loo, (6) paraffin 

 sections 103, 108, (c) collodion sections 96, 97, loi, 104, (rf) 

 98, 99, 102, 105, 106, already stained and in clearer. 



THE ORAL CAVITY. 



(10). Epithelium, glands. Section of the soft palate, cat. 

 Assigned for study (10). The oral side of the soft palate affords a 

 demonstration of the stratified epithelium of the oral cavity ; study 

 its appearance. In the substance of the soft palate are numerous 

 mucous glands, which open upon the mucosa of the oral cavity. 

 Serous glands are not present. Study their appearance and struct- 

 ure ; find if possible a duct leading to the surface. These would 

 belong to the group of palatine glands ; others would be lingual, 

 buccal or labial, according to their location. 



96. Developing tooth. Early stage. Transection 



through the cephalic part of the head of an embryo long. 



; collodion ; sections fx. Stain with hematoxylin 



and eosin. 



Within the section will appear the two nasal cavities and below 

 them the oral cavity, with the tongue projecting up from the floor 

 of the mouth. On each side, opposite the developing lower and 

 upper jaws, will be seen the dental ridge projecting from the epi- 

 thelium of the oral cavity. One of the four sections of dental ridge 

 will probably pass through a developing tooth, showing the cap- 

 like enamel organ covering the papilla which forms the dentine and 

 pulp of the adult tooth. 



