Orbital Vasculature Part II

Question 1

What are the arteries of the eyebrows

Answer 1

• supratrochlear artery (medial part or brow)

- supraorbital artery (lateral part of brow)

Question 2

What are the veins that drain the eyebrows

Answer 2

• supratrochlear vein (medial)
• supraorbital vein (lateral)

Both veins drain to either the angular vein or superior ophthalmic vein

Question 3

Arteries of the palpebrae

Answer 3

• lacrimal artery

- ophthalmic artery and branches

Question 4

What are the branches of the lacrimal artery associated with the palpebrae

Answer 4

Superior lateral palpebral artery

• peripheral palpebral artery
• marginal palpebral artery

Inferior lateral palpebral artery

• peripheral palpebral artery
• marginal palpebral artery

Question 5

What are the branches of the superior lateral palpebral artery associated with the palpebrae

Answer 5

Peripheral palpebral artery and marginal palpebral artery

Question 6

What are the branches of the inferior lateral palpebral artery

Answer 6

Peripheral palpebral artery

Marginal palpebral artery

Question 7

What are the branches of the ophthalmic artery associated with the palpebrae

Answer 7

• superior medial palpebral artery (and its peripheral and marginal branches)
• inferior medial palpebral artery ( and its peripheral and marginal branches)

Question 8

Medial and lateral marginal and peripheral palpebral arteries anastomose to form what

Answer 8

The peripheral and marginal palpebral arcades in each palpebral

Question 9

How do the medial and lateral marginal and peripheral palpebral arteries course

Answer 9

Between orbicularis oculi muscle and tarsal plate

Question 10

Vertical collateral branches of the medial and lateral marginal and peripheral palpebral arteries

Answer 10

Connect peripheral and marginal arcades and course on either side of the tarsal plate

Question 11

Branches posterior to the tarsal plate supply what

Answer 11

Palpebral conjunctiva, giving it a reddish pink hue

Question 12

Veins of palpebral

Answer 12

• superficial temporal vein (lateral part of palpebral)

- angular vein, superior and inferior ophthalmic veins (medial part of palpebrum)

Question 13

Lymph vessels of the palpebrae

Answer 13

Lymph from the lateral 2/3rds of the upper nad lower palpebrum drains into the preauricular lymph nodes, which lymph from the medial 1/3rd is drained to the submandibular nodes

Question 14

forniceal conjunctival arterial supply

Answer 14

Branches from peripheral palpebral arcade

Question 15

forniceal conjunctival venous supply

Answer 15

Small tributaries that drain into anterior ciliary veins

Question 16

Arterial supply of the bulbar conjunctiva

Answer 16

• posterior conjunctival arteries arising from peripheral palpebral arcade
• anterior conjunctival arteries arising from anterior ciliary arteries

Question 17

Where are the anterior conjunctival arteries situated

Answer 17

Between corneal limbus and posterior conjunctival arteries

• superficial pericorneal plexus (conj)
• deep pericorneal plexus (episclera)

Question 18

Venous supply of the bulbar conjunctiva

Answer 18

Small tributaries that drain into anterior ciliary vein

Question 19

Lymphatic of he bulbar conjunctiva

Answer 19

• lateral conj drains into the preauricular lymph nodes

- medial conj drains into the submandibular lymph nodes

Question 20

What is the cornea dependent upon

Answer 20

Aqueous humor, tear film, pericorneal plexus

Question 21

What kind of vasculature does the cornea have

Answer 21

None, its avascular

Question 22

Avascular structure, exceptions are episcleral plexus, deep scleral plexus, and intrascleral plexus

Answer 22

Sclera

Question 23

Arterial supply of choroid (posterior uvea)

Answer 23

• short posterior arteries via posterior scleral aperture
• distribute in suprachoroidal space out to equator of the eye
• anastomose with recurrent branches of long posterior ciliary arteries
• neuro regulated
• 85% of total ocular blood volume

Question 24

Where is 85% of total ocular blood volume?

Answer 24

Short posterior ciliary arteries in the choroid

Question 25

Venous drainage of the choroid

Answer 25

Vortex veins

Question 26

Arterial supply of the ciliary body (intermediate uvea)

Answer 26

- long posterior ciliary arteries pierce sclera and course anterior in suprachoroid to ciliary body - join perforating branches of anterior ciliary arteries to form the major arterial circle of the iris (located in ciliary body, not iris!) - recurrent branches supply choroid to equator

Question 27

Venous supply of ciliary body (intermediate uvea)

Answer 27

Vortex veins

Question 28

Arterial supply to iris

Answer 28

- radial arteries distribute in stroma of iris to form minor arterial circle of the iris around the iris collarette - part of blood-aqueous-barrier

Question 29

Venous supply of iris

Answer 29

Vortex veins

Question 30

Vasculature of crystalline lens

Answer 30

Non, avascular

Question 31

Vasculature of vitreous humor

Answer 31

None avascular

Question 32

Arterial supply of optic nerve

Answer 32

-plial plexus from small branches of the ophthalmic artery and central retinal artery

Question 33

Venous supply of the optic nerve

Answer 33

Venous pial plexus. Drains into central retinal vein

Question 34

Arterial supply of retina

Answer 34

Dual vascular supply

Question 35

What is the inner retinal layers supplied by (artery)

Answer 35

Central retinal artery

Question 36

What is the arterial supply to the outer retinal layer (photoreceptors)

Answer 36

Supplied by choroidal vasculature

Question 37

Communication between retinal arterial system and choroidal systme

Answer 37

None except in the cilioretinal artery

Question 38

Venous supply of retina

Answer 38

Central retinal vein