Longest pa of optic nerve -
The optic nerve is about 47- 50 mm in length and can be divided into 4 pas : intraocular (1mm), intraorbital (30mm), intracanalicular (6-9mm)and intracranial (10mm). Refer comprehensive ophthalmology 6th edition , A K Khurana , page no. 310
Intraocular
Intracranial
Intraorbital
Intracranial
Neuro-ophthalmology