THE ORBIT - BLOOD SUPPLY (normal anatomy)

Question 1

True or False: Not all arterial branches originate with ophthalmic artery

Answer 1

False (All)

Question 2

The principal arterial supply of the orbit is derived from?

Answer 2

Ophthalmic Artery

Question 3

It is the first major branch of the intracranial portion of the internal carotid artery

Answer 3

Ophthalmic Artery

Question 4

Where does the ophthalmic artery pass?

Answer 4

Beneath the optic nerve

Question 5

It is the first intraorbital branch

Answer 5

Central Retinal Artery

Question 6

About how many millimeters does the central retinal artery enter the optic nerve behind the globe?

Answer 6

8-15 mm

Question 7

This branch of the ophthalmic artery supplies the lacrimal gland and upper lid

Answer 7

Lacrimal Artery

Question 8

What do the short posterior ciliary arteries supply?

Answer 8

Choroid and parts of the optic nerve

Question 9

This branch of the ophthalmic artery supplies the ciliary body

Answer 9

2 Long posterior ciliary

Question 10

It is derived from the muscular branches to the rectus muscles

Answer 10

Anterior Ciliary Arteries

Question 11

It supplies the anterior sclera, episclera, limbus, and conjunctiva and contributes to the major circle of the iris

Answer 11

Anterior Ciliary Arteries

Question 12

True/False: Most posterior branches of the ophthalmic artery contribute to the formation of arterial arcades of lids

Answer 12

False (Most Anterior)

Question 13

The arterial arcades of the lids make an anastomosis with the external carotid circulation via?

Answer 13

Facial artery

Question 14

Primarily, the venous drainage of the orbit is through?

Answer 14

Superior and Inferior Ophthalmic Veins

Question 15

It is secondary to superficial infection of the periorbital skin

Answer 15

lethal cavernous sinus thrombosis

Question 16

Process of communication of the ophthalmic vein

Answer 16

Ophthalmic vein communicates with cavernous sinus VIA superior orbital fissure and pterygoid plexus VIA inferior orbital fissure

Question 17

True/False: Superior Ophthalmic Artery is initially formed from the supraorbital and supratrochlear veins and from a branch of the angular vein – all of which drain the skin of the periorbital region

Answer 17

False (Superior Ophthalmic Vein)