154 PRINCIPLES AND PRACTICE OF MILK HYGIENE 



The sub parotid lymph-gland is about 2~y 2 inches long, flat 

 and tongue-like in form and is located just under the anterior 

 border of the parotid salivary gland and about 3 inches below 

 the base of the ear. In feeling for this gland press the finger 

 inward and backward in the groove between the posterior border 

 of the lower jaw and the parotid salivary gland. 



The retropharyngeal lymph-gland, also called the pharyn- 

 geal and superior pharyngeal, is about 2 inches long and is 

 situated on the posterior wall of the pharynx. It can be pal- 

 pated, when enlarged, by pressing the extended fingers inward 

 from each side toward the median line and as far forward as 

 possible between the muscles of the neck and the larynx. 



The atlantal or posterior retropharyngeal lymph-gland is 

 situated under the wing of the atlas, partly covered by the 

 upper end of the submaxillary salivary gland. By pressing the 

 fingers inward and upward under the wing of the atlas this 

 gland is forced against the under surface of the wing of the 

 atlas. 



When any of these glands in cattle are enlarged and firm 

 and not hot or painful, tuberculosis is usually present. En- 

 largement of the retropharyngeal glands may interfere with 

 swallowing and respiration. 



Actinomycotic tumors may be observed in the submaxillary 

 and peripharyngeal regions as well as in the maxillae and tongue. 



9. Cough. Test each cow for cough by exerting 

 pressure with the fingers on the larynx or first three 

 rings of the trachea, or close both nostrils for about a 

 minute; also grasp the skin over the withers with the 

 fingers of both hands and draw it upward. Take note 

 of any coughing which occurs spontaneously and identify 

 the cow each time. 



A frequent, chronic cough is one of the most prominent 

 symptoms of pulmonary tuberculosis. If a cow can be made 

 to cough by pinching the larynx or the adjoining rings of the 

 trachea, or by closing the nostrils, it is an indication of disease 

 of the respiratory tract. Cough can usually be induced in this 



