Branches of Optic Nerve

Question 1

Branches of Optic Nerve:

Answer 1

Intra-ocular portion

Intra-orbital portion

Intra-canalicular portion

intra-cranial portion

Question 2

origin of Optic nerve:

Answer 2

OPTIC DISC - from the Axons of Ganglion cell layer of retina

Question 3

optic nerve is not a true nerve but rather a ______

Answer 3

1.1 - 1.3 millions of NERVE FIBER

Question 4

length of optic nerve:

Answer 4

50mm or 5cm long

Question 5

optic nerve extends from _______ up to the ________

Answer 5

optic disc - Lateral Geniculate body

Question 6

shortest part of optic nerve

Answer 6

Intra-ocular portion

Question 7

longest part of optic nerve

Answer 7

Intra-orbital portion

Question 8

passes the optic foramen & canal together with ophthalmic artery & sympathetic nerve

Answer 8

Intra-canalicular portion

Question 9

optic nerve that passes medially to form the optic chiasma

Answer 9

Intra-cranial portion

Question 10

consists of non-medullated / unmyelinated nerve fibers

Answer 10

Intra-ocular portion

Question 11

has myelinated nerve fibers sheathed with meninges

Answer 11

intra-orbital portion

Question 12

has S-shaped curve to permit free movement of eyeball

Answer 12

intra-orbital portion

Question 13

intra-orbital portion extends from ______ up to the _____

Answer 13

Optic foramen up to the Globe

Question 14

length of intra-ocular portion:

Answer 14

0.7 - 1 mm

Question 15

length of intra-orbital portion:

Answer 15

30 mm

Question 16

length of intra-canalicular portion

Answer 16

4 - 10 mm (average 6mm)

Question 17

length of intra-cranial portion:

Answer 17

10mm

Question 18

Fiber tracts of Optic Nerve:

Answer 18

1. Papilomacular bundle
2. Nasal bundle
3. Supratemporal bundle
4. Infratemporal bundle

Question 19

1 / 3 of total retinal fibers which comes from macular region to optic disc

Answer 19

Papilomacular bundle