NEUROANATOMY - Cerebral Blood Supply Flashcards
What is the course of the internal carotid artery?
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Which hole does the internal carotid artery go through?
Foramen lacerum
Where does the ophthalmic artery arise and start from?
Arises from medial aspect of ICA and starts medial to anterior clinoid process
What is the route of the ophthalmic artery?
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What are the branches of the ophthalmic artery?
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Where does the central retinal artery arise from? When does it change course?
- First branch of ophthalmic artery
2.Changes course 10-15mm inferiorly optic tract, pierces the optic nerve sheaths superiorly (dura, arachnoid pia) and travels within optic nerve and reaches retina
What is the course of the extraocular part of the central retinal artery?
Enters retina through lamina cribrosa and opening of sclera into optic cup.
What does the central retinal artery supply?
The inner 6 layers of the retina
What are the structures lateral to the ophthalmic artery as it enters the lateral component of the orbit? (4) What branch does it give here?
- Ciliary Ganglion
- III nerve
- VI nerve
- Lateral rectus
Gives a lacrimal branch –> lacrimal artery
Lacrimal artery gives branch lateral palpebral artery which supplies lateral side of eyelids
What branches does the ophthalmic artery give in the lateral compartment of the orbit? (2)
Gives a lacrimal branch –> lacrimal artery
Lacrimal artery gives branch lateral palpebral artery which supplies lateral side of eyelids
Recurrent meningeal artery –> travels in lateral SOF and anastamoses with middle meningeal artery (branch of external carotid artery)
What structures accompany the ophthalmic artery as it travels above the optic nerve in the medial compartment of the orbit? (2)
- Superior ophthalmic vein
- Nasociliary nerve
What branches does the ophthalmic artery give off in the medial compartment of the orbit?
Posterior ciliary artery –> divides into lateral and medial posterior ciliary arteries.
the long posterior ciliary arteries travel in the suprachoroidal space and reach ciliary body and form the major anastamosis
Where do the posterior ciliary arteries arise from?
Arise as two trunks from ophthalmic artery and divide into 10-20 branches
What do the short posterior ciliary arteries do?
Pierce sclera and supply choroid in segmental manner
Some branches form anastamotic ring around optic disc –> circle of Zinn-Haller
Which branch of the ophthalmic artery travels above the optic nerve and just superior to the LPS and superior rectus just below orbital roof and exits at the supraorbital notch?
Supraorbital artery (accompanied with supraorbital nerve)
How many anterior ciliary arteries are there? Where do they arise from?
- 7 in number, 2 for each recti, one for LR
- Muscular branches of the ophthalmic artery
What arteries are involved in the major arterial circle? Where do they start?
Anterior ciliary artery (70%) and long posterior ciliary artery (30%)
Pierces sclera 4mm from limbus
What happens at the major arterial circle?
Several branches run radially into the iris as iris vessels which anastamose at the pupillary margin which This forms the minor arterial circle
What arterial branches are formed from the ophthalmic artery at the medial compartment of the orbit?
Anterior ethmodial artery –> anterior ethmoidal foramen —-> nose
Posterior ethmoidal artery –> posterior ethmoidal foramen —-> nose
What are the terminal branches at the level of the superior oblique of the ophthalmic artery? (2)
- Dorsal Nasal - gives off medial palpebral artery (anastamoses with lateral palpebral artery from lacrimal artery —> superior and inferior marginal arcade)
- Supratrochlear -
What is the anterior portion of the optic radiation supplied by?
anterior choroidal artery
