Eye - Neurovasculature

Question 1

Where do CN3, 4,6 enter the orbit?

Answer 1

Superior orbital fissure

Question 2

What branches of the trigeminal nerve enter the orbit?

Answer 2

Maxillary and ophthalmic

Question 3

What allows sensory innervation of the eye?

Answer 3

V1 and V2

Question 4

What does the ophthalmic nerve innervate of the orbit?

Answer 4

Upper eyelid

Upper part of eyeball

Question 5

Where does V1 enter the orbit?

Answer 5

Superior orbital fissure

Question 6

What type of sensation does V1 supply to the orbit/eye?

Answer 6

General sensation

Question 7

Where does V2 enter the orbit?

Answer 7

Inferior orbital fissure and a small branch called the infra-orbital nerve leaves to come out through the Infraorbital formamen

Question 8

What are the 3 branches of the ophthalmic division?

Answer 8

Nasociliary
Lacrimal
Frontal

Question 9

What blood vessel does the ophthalmic artery arise?

Answer 9

Internal carotid artery

Question 10

What artery supplies all of the orbit and its contents?

Answer 10

Ophthalmic artery

Question 11

What does the ophthalmic artery divide into?

Answer 11

Question 12

What structures pass through the optic foramen?

Answer 12

Ophthalmic artery and optic nerve

Question 13

Name branches of the ophthalmic artery

Answer 13

1 = opthamic artery

2 = central retina, artery

3, 4,5 = short posterior ciliary arteries

6 = long posterior ciliary arteries

7,8 = anterior and posterior ethmoidal arteries

9 = muscular arteries

Question 14

What artery accompanies the optic nerve into the eyeball?

Answer 14

Central artery

Question 15

What does the central retina, artery supply?

Answer 15

Inner layers of the retina

Question 16

What do the short posterior ciliary arteries supply?

Answer 16

Posterior part of the choroid (and outer retina)

Question 17

What does the long posterior ciliary arteries supply?

Answer 17

Anterior choroid, ciliary body, iris

Question 18

What arteries supply in the inside vs outside of the retina?

Answer 18

Inner = central retina artery

Outer = choroid, which is in turn supplied. Y the short posterior ciliary arteries

Question 19

What eye is shown?

Answer 19

Left

Question 20

What is the black arrow pointing to?

Answer 20

Optic disc - start if the optic nerve, physiological blind spot

Question 21

What branches are the veins?

Answer 21

The thicker branches

Question 22

When does the central retina, artery split into 4?

Answer 22

When it reaches the optic disc

Question 23

What are the 4 branches of the central retinal artery?

Answer 23

Question 24

What are the nasal aspects of the eye? What artery lie on this side?

Answer 24

Superonasal

Inferonasal

Question 25

What is the temporal region of the eye and what nerves lie here?

Answer 25

Superotemporal

Inferotemporal

Question 26

Where do the veins from the eye drain to?

Answer 26

Inferior and superior ophthalmic veins

Question 27

What fissure do the ophthalmic veins pass through?

Answer 27

Superior orbital fissure

Question 28

Where do the ophthalmic veins drain into?

Answer 28

Cavernous sinus

Question 29

What is the cavernous sinus?

Answer 29

One of the venous sinuses inside the cranial cavity

Question 30

What space in the skull is the venous drainage located?

Answer 30

Dura mater layer

Intracranial venous sinuses

Question 31

What vein do the intracranial dural venous sinuses drain into?

Answer 31

Internal jugular vein

Question 32

What venous sinus drains the orbit?

Answer 32

Cavernous sinus

Question 33

What is the importance of the cavernous sinus clinically?

Answer 33

The cranial nerves that have to go into the orbit through the superior orbital fissure have to all pass through the walls soft the cavernous sinus

3,4,6 and loops of carotid artery

E.g. fistula, and orbit does not get enough blood supply

Infection of sinuses, venous drainage from orbit is impeded