CN IV (TROCHLEAR)-B. ORIGIN
From NeuroRehab.wiki
SUMMARY
It is somatic, hence it arises in the midline, at the floor of the aqueduct, in the midbrain, at the level of the inferior colliculus.
Reference(s)
R.M.H McMinn (1998). Last’s anatomy: regional and applied. Edinburgh: Churchill Livingstone. Get it on Amazon.
Drake, Richard L., et al. Gray's Anatomy for Students. Elsevier, 2023. Get it on Amazon.
