SYMPTOMS 115 
debility. As regards the origin of complete paralysis, 
the various parts of the body are controlled by certain 
centres in the brain, and any disease or abnormal con- 
dition which becomes located in this cortico-muscular 
brain centre, and inflames or inhibits the power of these 
centres, must involve a paralysis of the muscles which 
they control. 
These provocative lesions may owe their own origin 
to traumatism, inflammation, or the compression caused 
by inflammatory exudates, or actual degeneration of the 
Fic. 11.—PARALYSIS OF POSTERIOR EXTREMITIES. 
(After Miiller and Glass.) 
tissue itself. Pathological conditions of the brain cover- 
ings sometimes cause a paralysis of one part of the body, 
such as of the lower jaw, or one or other of the limbs, 
etc. In the former affection all power of opening or 
closing the jaw is lost, and mastication becomes there- 
fore impossible; the tongue hangs out, and saliva 
dribbles from the mouth. 
Paralysis is a frequent symptom of rabies, though 
somewhat rare in distemper. In paralysis of the limbs 
the affected leg or legs are never used, but are dragged 
along in a limp or flaccid state. 
