ANATOMY OF THE SALIVARY GLANDS IN THE CARNIVORA l6l 



orifices are rarely visible to the naked eye. The small opening (14) 

 lateral to the parotid was taken to belong to an element of this series. 

 It was found but once in five cats which were examined particularly 

 in regard to the orifices upon the stomal ridge. 



At the angulus oris the vestibule is continuous with the alveobuccal 

 sulci. Tliis term is applied to the space between the lip and alveolar 

 process as far forward as the canine teeth. The shallower sulci between 

 the incisor teeth and the hps are the alveolabial sulci. Tjpically the 

 furrows are separated at the diastema by transverse folds wliich extend 

 from the sockets of the canine teeth to the margin of the lips (diastemal 

 folds). The upper tends to be reduced in the carnivora ; in the cat it 

 is suppressed. In the embryo its presence is indicated only by the 

 primitive discontinuity of the superior alveobuccal and alveolabial 

 furrows. Caudad the alveobuccal furrows extend into the vestibule 

 as its dorsal and ventral boundaries; the superior is continuous 

 with the furrow dorsal to the stomal ridge ; the inferior terminates 

 near the border of the masseter. 



The superior alveolabial sulcus is a deep sinus, corresponding in its 

 region of greatest depth to the canine tooth, caudal to which it be- 

 comes shallow abruptly and is continuous with the superior alveo- 

 buccal sulcus. Opposite the incisors, also, it is shallow ; in the median 

 line it is separated from its fellow by a narrow fold extending from the 

 premaxillaries to the margin of the lip. 



The inferior alveolabial furrow is small; limited in the midline by a 

 minute fold between the symphysis and lip, it deepens beside 

 the canine tooth and ends abruptly at the diastemal fold. This 

 arises broadly from the lip and narrows to a pointed attachment to 

 the back of the socket of the canine. Its dorsum rises above the 

 general level of the lip in a fleshy pad, against which the upper canine 

 rests when the jaws are appro.ximated. 



The distinction between alveolabial and alveobuccal sulci is based 

 upon their frequent separation by diastemal folds, their primitive 

 discontinuity in the embryo, and certain dil?erences in their mode of 

 development which are described in Part VI of this work. 



Of the sulci the inferior alveobuccal alone is the site of macroscopic 

 glands. These to the number of 20-30 form a mass which extends from 

 the diastemal fold to the border of the masseter. Its summit produces 



