Flashcards in Trochlear Deck (11)
Which base of skull foramina does the trochlear nerve pass through?
Superior orbital fissure
What type of information is carried on the trochlear nerve?
What is the function of the trochlear nerve?
Motor supply to the superior oblique muscle
Where are the cell bodies of the motor neurones of CNIV located?
Midbrain trochlear nuclei
What are the functions of the superior oblique muscle?
Causes intorsion and depression of the eyeball
The trochlear nerve is the only cranial nerve to do what 2 things?
Decussate, and to exit the cranial cavity posteriorly
Once the trochlear nerve exits the midbrain (posteriorly), what does it do?
Wraps around the entire brainstem to find the anterior part again
What is the consequence of CNIV exiting posteriorly and travelling around the brainstem?
It is a long, thin nerve which is easily disrupted
Describe the intracranial course of the trochlear nerve?
Travels to the orbit along the lateral walls of the cavernous sinuses
Describe the extracranial course of the trochlear nerve?
Supplies the superior oblique in the orbit