Trochlear CN IV Flashcards
Where are the trochlear cell bodies located?
Trochlear Motor Nucleus
The trochlear motor nucleus is located at the level of the _____ near the _____ gray
Inferior colliculus; periaqueductal gray
The axons of Trochlear nerve course dorsolaterally, cross the _____ and emerge from the _____ surface. They then course through the _____ sinus and enter the orbit via _____.
Superior velum; DORSAL; cavernous; superior orbital fissure
What muscle is innervated?
Superior oblique muscle of contralateral orbit
What is the action of superior oblique muscle?
Incyclotorsion (Downward and Laterally)
Is it likely to lesion this nerve alone?
No, very rare (usually by trauma)
What is the clinical result if the trochlear nerve is lesioned?
Vertical diplopia, which can cause difficulty in looking down especially noticed when going downstairs.
Where is the Trochlear nucleus located?
Tegmentum of caudal midbrain
What is the name of the nucleus?
Trochlear motor
