CN IV Trochlear Flashcards
What is the smallest CN?
Trochlear
What muscle does trochlear nerve innervate?
Superior oblique
What is the nucleus of origin called?
Nucleus of trochlear nerve
The nucleus of trochlear n is located in the midbrain, anterior side of the cerebral aqueduct at the level of the lower part of this
Inferior colliculus
The nucleus of the trochlear nerve pass posterior through this
Tegmentum of mesencephalon
Where do fibers of the trochlear nerve decussate?
Tectum
After the decussation, fibers leave the midbrain at the lower margin of this
Inferior colliculi
What makes the trochlear n unique?
The only CN leaving the brain at the dorsal aspect
Where does trochlear n enter the dura mater at?
Cerebellar tentorium
After passing the dura, it continues through the lateral wall of what sinus?
Cavernous sinus
What two structures does the trochlear nerve communicate with?
Ophthalmic nerve
Internal carotid plexus
What ganglion is the ophthalmic nerve from?
Gasserian or trigeminal ganglion
Ophthalmic n deals with what fibers of the superior oblique?
Proprioceptive fibers
What is the cortical center of trochlear n?
Superior frontal gyrus or Brodmann 8
What other nerves are in the cortical center of trochlear?
Oculomotor and abducens
