1. The document provides information on the blood and nerve supply of the eye and optic nerve. It details the arteries like the ophthalmic artery that supply different parts of the eye. 2. It discusses the branches of arteries like the central retinal artery and posterior ciliary arteries. It also outlines the venous drainage of structures like the retina and choroid. 3. The document outlines the nerve supply to the eye from cranial nerves like the trigeminal nerve and the nerves involved in eye movement.

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3. BLOOD AND NERVE SUPPLY OF
EYE AND OPTIC NERVE
Presenter – Pushkar Dhir
Moderator – Dr .Samiksha Choudhary

4. INTERNAL CAROTID
CERVICAL
PETROUS
CAVERNOUS
•Caraticotympanic
•Pterygoid
CEREBRAL
•To Trigeminal Ganglion
•Sup.& Inf. Hypophyseal
•Meningeal
•Ant. & Middle
Cerebral
•Ant.& Post.
Communicating
•Ophthalmic
Lacrimal Artery
Central
Retinal
artery
Long & Short
Supra
Posterior ciliary
trochlear
Supra orbital arteries
Lacrimal &
Muscular Art
Ant.ciliary art.
1.
2.
3.
4.
5.
Ant. Ethmoidal
Post. Ethmoidal
Dorsal Nasal
External Nasal
Internal Nasal

5. Ophthalmic artery
 1st intracranial portion of the internal carotid
artery.
 It passes beneath the optic nerve and accompanies
it through the optic canal into the orbit.
 1st intraorbital branch is the central retinal artery,
which enters the optic nerve .
 Anterior branches of the ophthalmic artery forms
the arterial arcades of the eyelids.
 And further makes anastomosis with the external
carotid circulation via the facial artery.

7. Supratrochlear a. &
Supra-orbital
Ant. ethmoidal a.
Supra-orbital a
Post. ethmoidal a.
Muscular Branches.
(Ant.ciliary arteries
are derived from it)
Central Retinal Art.
Ophthalmic a.
(pierces the dural
sheath of optic
nerve at apex
& lie below &
then lateral to
optic nerve)
Lacrimal a.
(supply lacrimal
gland and upper
eyelid)
Post.Ciliary
(supply the
choroid and
parts of the
optic nerve)
Internal carotid a.

8.  LONG POSTERIOR CILIARY ARTERIES supply Ciliary body and anastomose with each other and with
the anterior ciliary arteries to form the major arterial circle of the iris.
 ANTERIOR CILIARY ARTERIES (7 in no.- (2 from each MR, SR, IR & 1 from LR) are derived from the
MUSCULAR BRANCHES to the rectus muscles. Pass anteriorly in episclera & supply the anterior
SCLERA, EPISCLERA, LIMBUS, AND CONJUNCTIVA
 Finally penetrate sclera near Limbus
Ciliary Muscle
Anastomose with Long Post.Ciliary

9. MAJOR ARTERIAL CIRCLE OF THE IRIS.

10. Supratrochlear a.
Supra-orbital a

11. Supratrochlear a. &
Supra-orbital
Ant. ethmoidal a.
Supra-orbital a
Post. ethmoidal a.
Lacrimal a.
Muscular Branches.
(Ant.ciliary arteries
are derived from it)
(supply lacrimal
gland and upper
eyelid)
Post.Ciliary
Central
Retinal Art.
Supplies retina &
optic nerve
(supply the choroid
and parts of the optic
nerve)
Ophthalmic a.
Internal carotid a.

12. ARTERIAL CIRCLE OF ZINN /HALLER
(in lamina cribrosa)
CRA Course
•Runs a wavy course , adherent to the dural sheath of optic nerve .
•10-15mm behind eye ball it pierces Dura & Arachnoid of optic nerve.
•In sub-arachnoid space it bends forwards & after a short course bend at approx right angle &
invaginates piamater to enter centre of the nerve.
• In Optic nerve --- it runs a straight course & pierce the lamina cribrosa to appear on o.disc.
•In Optic nerve head --- it lies superficially in nasal part of optic cup & divides into Sup. & inf. Tempoal & nasal branche

13. NFL
IpL
INL

14. RPE, R&C,ELM,ONL
B/S:- Choriocapillaries
Outer-plexiform layer
B/S:- CRA + partially by Choriocapillaries
INL,IPL,Ganglion cell layer,NFL,ILM
B/S:- CRA
Macula Region
B/S:- Superior & Inferior temporal branches
**In 20% population Cilioretinal Artery supplies macula.(in case of CRA occlusion it helps to retain vision)
**Retinal art. are END ARTERIES.

15. B/S OF OPTIC NERVE
INTRAOCULAR
PART
1.Surface NFL:Supplied by capillaries
from retinal arterioles.
2.Pre-laminar region:Supplied by vessels of
ciliary region i.e
peripapillary choroidal
vessels.
3.Lamina Cribrosa :Supplied by ciliary
vessels derived from
short Post Ciliary &
arterial circle of zinn.
4.Retrolaminar Region:Supplied by both
retinal & ciliary
circulation
INTRAORBITAL
PART
•Periaxial System
(derived 4m
Ophthalmic art, Long
& short ciliary art,
lacrimal art ,CRA
)supplies periaxial part
of optic nerve.
•Axial system derived
4m CRA, collateral
arteries , intraneural
branches supplies
axial part
INTRA
CANALICULAR
PART
Supplied by
periaxial system
of vessels formed
by ophthalmic &
collaterals
arteries.
INTRACRANIAL
PART
Supplied by
periaxial system
of vessels formed
by cerebral &
anterior
communicating
arteries.

16. Central
Retinal Art.
Intraocular + Intraorbital part
Intraorbital + intracanalicular part

17. Main B/S of
1.Optic Chiasma :- branches from Ant.cerebral & internal carotid.
2.Optic tract :-branches from Post.communicating art.,Ant.choroidal art. & MCA.
3.LGB:- Post.cerebral Artery -> supply postero-medial part of LGB &
therefore the Superior quadrents fibres.
Ant.choroidal artery -> supply antero-lateral part of LGB -> inferior quadrents fibres.
*Hilum region in LGB is supplied by both PCA and Ant.choroidal
4.Optic radiations :- Ant.choroidal art , Calcarine branches of PCA, branches of MCA.
5.Visual Cortex :- Post.cerebral artery via calcrine arteries + post.temporal & parieto-occipital arteries.

18. Venous Drainage
•
VENOUS DRAINAGE OF THE INNER RETINA
occurs via the central retinal vein  to the superior ophthalmic vein cavernous sinus 
internal jugular vein.
•
THE OUTER RETINA, CHORIOCAPILLARIS, AND CHOROID are drained through the vortex
veins join the central retinal vein  superior ophthalmic vein  cavernous sinus and
jugular vein circulation.
•
The vortex veins drain the choroidal circulation via superior and inferior ophthalmic veins.

19. Sup. Ophthalmic v.
Inf. Ophthalmic v.
Cavernous sinus
Facial v.
Retromandibular v.
Pterygoid plexus

21. NERVE SUPPLY
• Sensory N/S –
*Trigeminal nerve
(Mixed nerve) V
*Ophthalmic (V1) &
Maxillary(V2)
divison play main role of
eye sensation.
• Motor N/S --
*Cranial nerve 3rd ,4th,6th
for ocular movements.
*Cranial nerve 7th for
eyelid closure.
• Sympathetic N/s --* Nasociliary branch of
ophthalmic nerve
• Parasympathetic N/S:-- * Occulomotor (3rd).

22. TRIGEMINAL N.
OPHTHALMIC
MAXILLARY
(gives infraorbital nrv)
MANDIBULAR
NASOCILIARY N.
FRONTAL N.
LACRIMAL N.
•SUPRA-ORBITAL
•SUPRA-TROChLEAR
Supply
Forehead + Scalp
+ Conjunctiva +
upper & central
eyelid
•Ant.Ethmoidal –----- Supplies Ethmoidal Sinus ,
Internal & Ext.Nasal
•Post.Ethmoidal ------ Supplies Sphenoidal Sinus
Supplies to
lateral eyelid
+ lacrimal
gland +
conjunctiva
•Infratrochlear -------- Medial Eyelid
•Long Ciliary Nerves---Pierces Sclera & Supply
Cornea, Iris, Ciliary Body
•Sympathetic Fibres---Dilate Pupil

23. Abducens nrv.
Ophthalmic nrv.

24. •
•
•
•
•
•
The nerves of the orbit include those that enter through the superior orbital fissure and supply the
ocular muscles :
Oculomotor (CN III),
Trochlear (CN IV), and
Abducent (CN VI) nerves.
The trochlear and abducent nerves pass directly to the single muscle supplied by each nerve.
The oculomotor nerve divides into a
superior branch supplying superior rectus & LPS
inferior branch supplying the medial & inferior rectus and inferior oblique,
+ carry presynaptic parasympathetic fibers (miosis) to the ciliary ganglion.

25. B/S & N/S Of Various Structure of Eye
(Review)
Conjunctiva –
B/S:- Ant.Ciliary Artery.
N/S:Superiorly
Supraorbital nerve,
Supratrochlear nerve
Infratrochlear nerve
Inferior:-Infraorbital
nerve
Lateral:-Lacrimal nerve
Circumcorneal:-Long
ciliary nerves
IRIS B/S:- Ant .& Post. Ciliary
arteries
NS:Long ciliary nerves
Sclera:B/S:- Avascular
N/S:- long ciliary nerves anteriorly
& short ciliary nrv. Behind equator
Episclera :B/S:- long & short
ciliary arteries
Cornea –
B/S:- avascular
N/S:- long ciliary
nerves (nasociliary
nerves)

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