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blood vessels of the eye
N/A
21
Anatomy
Undergraduate 1
12/09/2008

Additional Anatomy Flashcards

 


 

Cards

Term

What are the two systems of blood vessels in the eye?

 

Definition
ciliary circulation and retinal circulation
Term
how many short posterior ciliary arteries are there?
Definition
15-20
Term
how do the short posterior ciliary arteries enter the eye?
Definition

pierce the sclera around the optic disc.

-form fine episcleral plexus

-form Circle of Zinn

Term
as the short posterior ciliary arteries terminate, what are they called?
Definition
choriocapillaris
Term
how many layers do the choriocapillaris form?
Definition

1

anastomosed

Term
what do the choriocapillaris supply?
Definition
photoreceptors, RPE, choroid
Term
what happens to the branching and size of short posterior ciliary arteries as they deeper?
Definition

They branch more and get smaller

Haller's (huge, least branched)

Sattler's (small)

choriocapillaris (smallest, most branched)

Term
how man long posterior ciliary arteries are there?
Definition

2

-1 nasal

-1 temporal

Term
trace the path of the long posterior ciliary arteries.
Definition
pierce sclera at posterior --> travels initally in sclera, then epichoroid --> at ora serrata branch into inf. and sup. divisions --> inf. and sup. divisions anastomose --> forms major arterial circle of iris
Term
what muscle do the anterior ciliary arteries pass through?
Definition

rectus muscles

-2 from each rectus except lateral which carries 1

Term
trace the path of the anterior ciliary arteries.
Definition
pass through rectus muscles --> pierce eye close to limbus --> runs initially in episclera --> forms episcleral plexus --> becomes intrascleral plexus as goes deeper --> joins MAC --> supplies anterior of eyeball
Term
What are the main divisions of the central retinal artery?
Definition

superior papillary artery

inferior papillary artery

Term
In what layers can you find retinal venules and arterioles?
Definition

NFL

capillary beds go no further than INL

Term
what area of the retina has the most capillary networks?
Definition
the macula region - it has 3
Term
what are the two veins of the eye?
Definition

central retinal vein - retinal cirulation

vortex veins - ciliary circulation

Term
how does blood leave the retina?
Definition
capillary beds --> venules --> veins --> central retinal vein
Term
How many vortex veins are there?
Definition

4

2 superior

2 inferior

Term
What drains into the vortex veins? Where do vortex veins drain into?
Definition

vortex veins drain iris, ciliary body and possibly the canal of schlemm and intrascleral plexus

vortex veins drain into the appropriate ophthalmic vein

Term
how many anterior ciliary veins are there?
Definition

14

4-superior rectus

4-inferior rectus

4-medial rectus

2-lateral rectus

Term
what is the path the blood takes through the anterior ciliary veins?
Definition
canal of schlemm, intrascleral plexus, episcleral plexus --> anterior ciliary veins --> muscle veins --> appropriate ophthalmic vein
Term
what are two retinal blood vessel anomalies?
Definition

cilioretinal artery - looks like hook, instead of stopping at choroid, comes into retina

 

opticociliary vein - veins that were to form vortex vein join central retinal vein instead

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