308 DEVELOPMENT OF SALIVARY GLANDS IN THE DOMESTIC CAT 



diately ventrad of the cranial process and pars lata. It would seem, 

 therefore, that not the whole of the Wangenstreifen is included in the 

 ventral lamina. The hning epithelium of the cheek thus appears as 

 the expansion of parts immediately adjacent to the buccal sulcus. 



28a 



rv 



28 



Fig. 165. Schema of alveobuccal 



1. Buccal sulcus. 



la. Secondary buccal sulcus. 

 lb. Subparotid sulcus. 



2. Angulus oris. 



7. Orbital inclusion, pars lata. 



S. Orbital inclusion, pars cylindrica. 



Lateral process of orbital inclusion. 



Parotid anlage. 



Orbitoparotid sprout. 



First orbital gland. 



9- 



12. 



17- 



20. 



and alveolabial sulci, late stage. 



21. Second orbital gland. 



22. Third orbital gland. 

 2j. Caudal orbital glands. 



25. Superior alveobuccal sulcus. 



26. Inferior alveobuccal sulcus. 

 2(V. Inferior alveolabial sulcus. 

 28a. Superior alveolabial sulcus. 

 54. Inferior maxilla. 



/_?. Masseter muscle. 



J4. Internal pterygoid muscle. 



Like the rest of the marginal cavity their development is modified 

 and retarded where they are in relation to the masseter. 



5. The orbital glands arise in the course of the secondary buccal 

 sulcus in a dorsal parietal position. They are the results of a process 

 of proliferation unaccompanied by flange formation. The first three 

 form keels which advance craniad and are separated by constriction 

 from the oral epithehum to form the ducts. The caudal members 

 of the series appear to be simple sprouts. As the secondary buccal 

 sulcus is evidently equivalent to the superior alveobuccal with which 

 it becomes continuous, its glands are homodynamous with superior 



