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2.  Visual pathway or optic pathway is the nervous
pathway that transmits impulses from retina to
visual center in cerebral cortex.
 Components :-
 a) Optic nerve
 b) Optic chiasma
 c) optic tract
 d) Lateral geniculate body
 e) Optic Radiation
 f) Visual cortex


4.  Extent :- Optic disc to optic chiasma
 2nd cranial nerve
 Size :- 47-50mm
 Formation :- Axons of ganglionic cells of
retina

5.  Intraocular part
 Intra-orbital part
 Intra-canalicular part
 Intracranial part

6.  Size :-1mm
 Starts from optic disc, pierces the choroid
and sclera,converting it into sieve like
structure lamina cribrosa

7.  Extend :- From back of the eyeball to optic
foramina.
 Size :-30mm
 Relation :-
 - Ant : separate from ocular
muscles by the orbital fats
 - post : closely surrounded by
Annules of zinn and origin of four rectus
muscles.

8.  Lies within the optic canal
 Size :-6-9mm in length
 Relation :-
 a) inferolateral :- Opthalmic artery
 b) Medial :- Ethmoid and post
ethmoid sinus
 4) INTRACRANIAL PART :-
 - Lies above the cavernous sinus
 - 10mm

9.  Flattended structure measuring
 Horizontally :- 12mm
 Anterio-posterioriy :- 8mm
 It lies over diaphargma sellae
 Fibers originating from nasal decussate at
the chiasma

10.  Bundles of nerve fibers running outwards
and backwards from postero-lateral aspect
of optic chiasma
 Consist of temporal fibers of retina of same
eye and nasal half of opposite eye
 Each optic tract end in LGB

11.  Oval structure
 Situated at posterior termination of tract
 Each geniculate body consists of 6 layer of
neurons with white matter
 # Function of LGB :-
 To relay visual information from optic tract
to visual cortex
 To get transmission of signals of visual
cortex

12.  Extend :-From LGB to visual cortex
 3rd order neuron
 Superior fibers of radiation proceed directly
posteriorly through parietal lobe

13.  Location:- Medial aspect of occipital lobe,above
and below calcarine fissure
 Areas :-
 1) primary visual area(Area 17)
 - perception of visual impules
 2) Secondary visual area(Area 18)
 - Interpretation of visual impules
 3) Occipital eye field(Area 19)
 - concerned with movements of eyeball

14. Thank you all