"The trochlear nerve is the fourth (CN IV) and thinnest cranial nerve. It exits the midbrain posteriorly, eventually passes into the cavernous sinus and into the orbit where it supplies superior oblique muscle with motor fibres (TA: nervus trochlearis or nervus cranialis IV)."
Expected headings
"Nucleus and intraparenchymal portion"
"Cisternal portion"
"Cavernous sinus portion"
"Orbital portion"