VMD-0079
QUESTION
Spasm of masseter muscle leading to restriction of jaw muscle movement is seen in one of the following diseases?
OPTIONS
(A) Enterotoxaemia
(B) Tetanus
(C) Botulism
(D) Rabies
ANSWER
(B) Tetanus
EXPLANATION
Tetanus causes sustained contraction of skeletal muscles because tetanospasmin blocks inhibitory neurotransmission; spasm of the masseter muscles produces trismus or lockjaw. Botulism causes flaccid paralysis, while enterotoxemia and rabies do not characteristically cause persistent masseter spasm as the defining sign.
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