Which is the smallest part of optic nerve: (A) Intraocular, (B) Intraorbital, (C) Intracanalicular, (D) Intracranial
Answer is A. Intraocular - 1 mm.
Intraorbital - 30 mm.
Intracanalicular - 6-9 mm.
Intracranial - 10 mm.