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 |  | Fourth Nerve Palsy There are ten cranial nerves, each in charge of a different function,  like the sense of smell, the optic nerve, and the one that controls  most eye movement.  The fourth nerve, the trochlear, is in charge of  only one eye muscle, called the  superior oblique , which moves each eye downward and inward, with some rotational effect also. 
 
    
 
     
 
 
 
 The fourth nerve, also called the  trochlear  nerve is the  longest of the cranial nerves, and the one most sensitive to damage fr...Read More
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