Vessels Of Orbit

Question 1

Ophthalmic artery origin

Answer 1

ICA as it leaves cavernous sinus

Question 2

Ophthalmic artery course and end

Answer 2

1. Enters optic foramen inferolateral to optic nerve then becomes lateral to it
2. In orbit, the artery crosses optic nerve from lateral to medial
3. Passes forwards along orbital medial wall between superior oblique muscle and medial rectus muscles
4. Ends by dividing into 2 terminal branches

Question 3

Terminal branches of ophthalmic artery (2)

Answer 3

1. Supratrochlear artery
2. Dorsal nasal artery

Question 4

Ophthalmic artery branches (10)

Answer 4

1. Central retinal artery
2. Lacrimal artery
3. Ciliary artery
4. Muscular branches
5. Supraorbital artery
6. Anterior ethmoidal artery
7. Posterior ethmoidal artery
8. Medial palpebral arteries
9. Supratrochlear artery
10. Dorsal nasal artery

Question 5

Central retinal artery course

Answer 5

Most important branch
1. Arises in optic canal behind optic nerve
2. Enters optic nerve 1cm from eyeball
3. Passes inside it
4. Reach retina
End artery and obstruction leads to blindness

Question 6

Lacrimal artery course

Answer 6

Largest branch
1. Arises near exit from optic canal
2. Passes along orbital lateral side

Question 7

Lacrimal artery supply (2)

Answer 7

1. Lacrimal gland
2. Upper lid

Question 8

Lacrimal artery branches (4)

Answer 8

1. 2 zygomatic branches
2. Recurrent meningeal branch
3. Lateral palpebral arteries

Question 9

Zygomatic branches course

Answer 9

1. One reaches temporal fossa via zygomaticotemporal foramen
2. Other reaches face via zygomaticofacial foramen
   It gives recurrent meningeal branch

Question 10

Recurrent meningeal branch course

Answer 10

1. Passes backwards via lateral part of superior orbital fissure
2. Anastomose with orbital branch of middle meningeal artery
   Ends as lateral palpebral artery

Question 11

Lateral palpebral artery course

Answer 11

1. Run medial in upper and lower eyelids
2. Anastomose with medial palpebral artery

Question 12

Ciliary artery branches (2)

Answer 12

1. Posterior ciliary
2. Anterior ciliary

Question 13

Posterior ciliary artery

Answer 13

1. Long and short
2. Pass to eyeball back
3. Pierce sclera

Question 14

Anterior ciliary artery

Answer 14

1. From muscular branches
2. Supply iris

Question 15

Muscular branches

Answer 15

Supply orbital muscles

Question 16

Supraorbital artery course

Answer 16

Arises as ophthalmic artery cross optic nerve

Question 17

Supraorbital artery supply (2)

Answer 17

1. Upper lid
2. Forehead

Question 18

Anterior and posterior ethmoidal arteries course

Answer 18

Pass through ethmoidal foramina

Question 19

Anterior and posterior ethmoidal artery supply

Answer 19

Ethmoidal air cells

Question 20

Medial palpebral arteries course

Answer 20

Arise from ophthalmic artery termination

Question 21

Medial palpebral arteries supply

Answer 21

2 arteries supplying:
1. Upper eyelid
2. Lower eyelid

Question 22

Supratrochlear artery supply (2)

Answer 22

One of the 2 terminal branches supply:
1. Upper lid
2. Forehead

Question 23

Dorsal nasal artery supply

Answer 23

Other terminal branch
Supply:
Nose dorsum

Question 24

Ophthalmic vein course

Answer 24

2 in number
1. Union of veins accompanying ophthalmic artery branches
2. Superior and inferior ophthalmic veins leave orbit through superior orbital fissure
3. End in anterior end of cavernous sinus

Question 25

Central retinal vein end

Answer 25

In:
1. Cavernous sinus
2. Superior ophthalmic vein