Blood supply of the orbit and its contents Flashcards
Which structures are supplied with blood?
Blood supply is to all structures in
the orbit including eyeball.
Which blood vessels supply blood?
Blood supply is mainly by
ophthalmic artery and
infraorbital artery
What happens to the ophthalmic artery after it exits the cavernous sinus?
The ophthalmic artery is a branch of internal carotid
artery (ICA) after it leaves
cavernous sinus
What does the ophthalmic artery enter the orbit with?
The ophthalmic artery enters the orbit with optic nerve at
optic canal.
How does the ophthalmic artery lie within the orbit?
Within the orbit the ophthalmic artery lies inferior and
lateral to optic nerve.
What does the ophthalmic artery cross as it passes forward?
As the ophthalmic artery passes forward it crosses
superior to optic nerve and
proceeds anteriorly to medial side
of orbit.
What does the ophthalmic artery give off within the orbit?
Within the orbit the ophthalmic artery gives off
numerous branches (ten in
total)!!!!
List the branches of the ophthalmic artery.
1) Lacrimal
2) Central retinal
3) Long and short posterior
ciliary
4) Muscular (anterior
ciliary)
5) Supraorbital
6) Posterior ethmoidal
7) Anterior ethmoidal
8) Medial palpebral arteries
9) Dorsal nasal
10) Supratrochlear
State the course of the lacrimal branch of the ophthalmic artery.
• Arises at lateral side of optic nerve • And passes anteriorly on lateral side of orbit • Passes along superior border of lateral rectus
Which structures does the lacrimal branch supply?
Lacrimal gland, conjunctiva and
lateral side of eyelids
State the course of the central retinal branch of the ophthalmic artery.
• Pierces dural sheath of
optic nerve
• Runs to eyeball
• Branches at optic disc
Which structures does the central retinal artery supply?
Optic retina
(except rods
and cones)
State the course of the short posterior ciliary branch of the ophthalmic artery.
Pierces sclera at
periphery of optic
nerve.
Which structures does the short posterior ciliary branch supply?
Choroid and then
rods and cones
State the course of the long posterior ciliary branch of the ophthalmic artery.
Pierces the sclera
Which structures does the long posterior ciliary branch supply?
Ciliary body and Iris
What is the muscular branch of the ophthalmic artery also referred to?
The muscular branch of the ophthalmic artery is also referred to as the anterior ciliary
State the course of the muscular branch of the ophthalmic artery.
• Pierces sclera at attachments of recti muscles • Forms a network in iris and ciliary body
Which structures does the muscular branch supply?
Iris and ciliary body,
superior + M, L, S
recti
State the course of the supraorbital branch of the ophthalmic artery.
Passes superiorly and
posteriorly from
supraorbital foramen
Which structures does the supraorbital branch supply?
Forehead and scalp
State the course of the posterior ethmoidal branch of the ophthalmic artery.
Passes through
posterior ethmoidal
foramen
Which structures does the posterior ethmoidal branch supply?
Posterior ethmoidal
cells
State the course of the anterior ethmoidal branch of the ophthalmic artery.
• Passes through anterior
ethmoidal foramen
• Enters anterior cranial
fossa
Which structures does the anterior ethmoidal branch supply?
• Anterior and middle ethmoidal cells • Frontal sinus • Nasal cavity (septum and lateral wall) and skin of dorsum of nose
State the course of the dorsal nasal branch of the ophthalmic artery.
Along dorsal aspect of
nose
Which structures does the dorsal nasal supply?
Upper surface of the nose
State the course of the supratrochlear branch of the ophthalmic artery.
Passes from supraorbital
margin
Which structures does the supratrochlear branch supply?
Forehead and scalp
State the course of the infraorbital artery.
• Branch from third part of maxillary artery • Which is a branch from External carotid artery. • Passes on infraorbital groove and through infraorbital foramen
Which structures does the infraorbital artery supply?
Inferior rectus and
inferior oblique
Name 2 ophthalmic veins.
Superior and inferior
ophthalmic veins
What do the Superior and inferior
ophthalmic veins pass?
The Superior and inferior
ophthalmic veins pass through the superior orbital fissure to reach the cavernous sinus
What does the central vein of retina join?
The Central vein of retina may
join ophthalmic veins or
join cavernous sinus
directly
What do the vorticose veins drain?
The Vorticose veins drain
vascular layer into inferior
What does the scleral venous sinus encircle?
The Scleral venous sinus
encircles the anterior chamber
and drains the aqueous humor.
