Lecture 6: 12/1

Question 1

vascular tunic 3 regions are: (listed posterior to anterior)

Answer 1

choroid, ciliary body, iris

Question 2

what is a homologous structure to the choroid

Answer 2

pair matter and dura matter in the brain

Question 3

what are the choroid’s few distinguishing factors

Answer 3

lots of pigment (dark brownish appearance) and extreme vascularity

Question 4

function of the choroid is to

Answer 4

supply nutrition and oxygen to the outer 1/2 of the retina

Question 5

what is the extent of choroid (posterior to anterior)

Answer 5

posteriorly from the optic nerve to an area called the ora serrata

Question 6

what is the thickness of the choroid at its thickest part?

Answer 6

0.22mm thick at the thickest part at the optic disk

Question 7

thick and thin regions of the choroid are

Answer 7

thickest at optic disc, gets thinner as it goes forward, thin at ora serrata

Question 8

thickness of the choroid at the ora serrata

Answer 8

0.1 - 0.15 mm thick

Question 9

what is the parachoroidal space?

Answer 9

between the vascular tunic and fibrous tonic, potential space that runs nerves/vessels from posterior to anterior of the eye

Question 10

what is the parachoroidal space continuous with

Answer 10

the paraciliary space between the ciliary body and fibrous tunic

Question 11

list 4 layers of the choroid from most external to most internal

Answer 11

1. suprachoroid (most external)
2. vascular layer
3. choriocapillaris
4. bruch’s membrane

Question 12

how many lamella are in the suprachoroid

Answer 12

10-15 lamella

Question 13

the suprachoroid blends outward into the _____ ____ of what structure?

Answer 13

lamina fusca in the sclera

Question 14

what is the lamella structure in the suprachoroid?

Answer 14

delicate mesh of collagen fibers

Question 15

what is within the mesh of collagen fibers in the lamella of the suprachoroid?

Answer 15

melanocytes and fibroblasts

Question 16

what are muscle stars in the suprachoroid?

Answer 16

smooth muscle fibers that are found in the tail end of the muscle of the ciliary body, form little “stars” found anterior to the equator

Question 17

are there melanocytes in the suprachoroid layer?

Answer 17

yes

Question 18

are there arteries and veins found in the suprachoroid layer?

Answer 18

yes

Question 19

are there nerves supplying the suprachoroid and what are they?

Answer 19

yes, ciliary nerves that do supply innervation

Question 20

stroma layer of the choroid can also be called the

Answer 20

vascular layer or vessel layer

Question 21

what is special about the stroma of the choroid?

Answer 21

essential constituent in branching blood vessels

Question 22

what are the two layers of the stroma of the choroid?

Answer 22

external (Haller’s Layer)

internal (Satler’s Layer)

Question 23

what happens to the diameters of the vessels in the stroma of the choroid as you travel inwards?

Answer 23

the diameter gets smaller

Question 24

the vessels in the stroma of the choroid are surrounded by what type of tissue?

Answer 24

vessels surrounded by collagen loose connective tissue

Question 25

are there melanocytes in the stroma of the choroid?

Answer 25

yes

Question 26

why aren’t blood clots as big of a deal in the stroma of the choroid?

Answer 26

there is such a meshwork that the blood can flow around more