DISEASES OF THE TEETH 



43 



Inflammation of the Salivary Glands. 



{Parotitis; Mumps.) 



Inflammation of the glands of the ear (parotiditis) appears either 

 as a consequence of some mechanical cause, or by infection from the cav- 

 ity of the mouth, from some existing inflammation of that part, as a 

 disease, due to the presence of a micrococcus which develops in the saliva 

 in the form of a diplostreptococcus or by direct infection from the blood 

 itself in the form of a diplococcus or from metastasis (septicaemia, pyaemia, 

 or^ in rare instances, distemper) . The latter requires special mention as 



Fig. 23. — Glands of the head: 1, parotid gland; 2, submaxillary gland; 3, subzygomatic gland; 4, 

 Wharton's duct; 5, Bartholin's duct; 6, palatine gland; 7, orbital gland; 8, Nuckian duct; 9, lachrymal 

 gland. 



a primary idiopathic parotitis (mumps). The writer has frequently 

 seen the gland in the region of the ear affected, more rarely the glands 

 of the lower jaw, and, least of all, the glands of the eye. 



Etiology. — This disease is rather rare in the dog, but sometimes it 

 may take the form of an epizootic (Hertwig, Schussele). In these cases it 

 is probably due to some infecting virus that gets into the gland through 

 Steno's duct. The exact nature and time of incubation of this disease 

 are not known. 



