DISEASES OP GLANDS 277 



What is perilymphadenitis ? 



An acute purulent inflammation of a lymph gland involv- 

 ing the connective tissue surrounding the gland. 



What is specific lymphadenitis ? 



Inflammation of a lymph gland due to specific germs, as. 

 ganders, tuberculosis, actinomycosis, equine distemper, etc. 



What forms of lymphadenitis are of practical interest ? 



Depending on the cause, they may be traunlatic or infec- 

 tious as to their origin ; lymphogenous or hematogenous, 

 primary or secondary, as to the course, acute or chronic; as to- 

 tlie type of inflammation, purulent, parenchymatous, inter- 

 stitial. 



Which are the more comm,on diseases productive of lympha- 

 denitis ? 



Septic cellulitis, infected wounds, pharyngitis, nasal 

 catarrh, empyema of the maxillary sinus. 



Which lymph glands are often inflamed in horses and cattle f 

 In the horse : The submaxillary lymph glands, the glands . 



underneath the mastoid humeralis at the point of the shoulder 



(shoulder aibscess). 



Cattle : The glands of the head and neck and those of the . 



mammary gland. 



Desembe pa/renchymatous lymphadenitis. 



In this form, the glandular tissue proper undergoes, 

 changes as a consequence of the inflammation, the blood ves- 

 sels dilate and a serous exudate occurs ; here the process may 

 stop. There is swelling and pain due to the infiltration of the 

 glandular tissue ; as soon as this is absorbed the swelling 

 recedes. But when the irritant is of sufficient virulence, the 

 process goes on further, the glandular tissue becomes necrotic,^,. 



