PARALYSIS OF THE MUSCLES OF MASTICATION. 
99 
exists, recovery, as in Siedamgrotzky s case, may be expected. When 
suppuration has occurred, the parts must be washed out with sublimate 
solution, solution of iodine in iodide of potash, or with iodoform aether. 
Any fragments of bone must be removed. Re-section of the joint was 
successfully performed by Frohner, but is only commendable as a last 
resort. Delamotte recommends injecting the cavity with carbolic or 
sublimate solution, and limiting the movement of the lower jaw as far as 
possible by means of a tightly applied nose strap. Fluid nouiishment 
alone is indicated. 
(5.) PARALYSIS OF THE MUSCLES OF MASTICATION. 
PARALYSIS OF THE LOWER JAW (SO-CALLED). 
A condition in animals has been described where, in consequence of 
diplegia of the masticatory muscles, the mouth cannot be closed. It 
may more correctly be termed paralysis of the muscles of mastication, 
or masticatory facial paralysis, as it is styled in man. According to 
present information, it seems almost entirely confined to dogs and cats, 
but Roll, Waltrup, and Lydtin have also seen it in the horse. 
Both the masseters and the temporal muscle are supplied with motoi 
twigs from the third branch of the fifth cranial nerve, which arises in 
the pons varolii. One-sided paralysis of this nerve is much less frequent 
in animals than double-sided paralysis, but double-sided paialysis in cats 
and dogs has been repeatedly described. The condition occurs almost 
invariably during the progress of rabies, in fact is seldom seen unasso¬ 
ciated with it, and therefore its presence always awakens suspicion. 
Although Gerlach insisted on its acceptance as a sure sign of madness, 
dogs and cats thus affected often recover completely, the surest proof that 
Gerlach’s statement is incorrect. Korber and Frohner have noticed the 
same thing in dogs. 
The anatomical changes causing the disease are at present unknown , 
they are probably due to some diseased condition in the pons varolii. As 
a great number of nerve centres exist in this portion of the brain, it 
is not remarkable that this disease is frequently accompanied by other 
nervous disorders. In the case described by Korber, paralysis of the 
pharynx and muscles of the throat and breast supervened. Tempel 
records a case where a fibro-sarcoma extending from the guttuial pouch 
had pressed on the facial and trigeminal nerves, paralysing them and 
producing the above symptoms. But that isolated cases of paralysis of 
these motor nerves occur, and may recover, is shown by the following 
illustrations :— 
A grey pointer was sent to hospital on the 1st February, 1883, with the 
report that it had received an excessive quantity of beer some days previously, 
r H 2 
