Facts about 4th nerve

Q. which of the following is not true about trochlear nerve
a. has longest intracranial course
b. supplies ipsilateral sup. oblique
c. arise from dorsal aspect
d. enters orbit through sup. orbital fissure outside annulus of zinn

ANSWER:

here answer clearly is option B because 4th nerve supplies contralateral sup. oblique..

Thus in AIIMS and ALL INDIA ans. for the longest inracranial course is 4th nerve only