Choroid

Question 1

What is the choroid

Answer 1

middle layer that sits between the sclera and the retina

Question 2

what is the choroids main job

Answer 2

to supply the needs of the photoreceptors as the choroid is full of blood vessels and stroma

Question 3

layers of the choroid

Answer 3

• bruchs membrane
• choriocapillaris
• choroidal stroma
  hallers layer
  sattlers layer
• suprachoroidal lamina (lamina fusca)

Question 4

suprachoroidal lamina

Answer 4

next to sclera
melanocytes
connective tissue
avascular

Question 5

choroidal stroma

Answer 5

hallers layer - large arteries and veins branch to form
sattlers layer - intermediate arteries and veins branch to form choriocapillaris
both layers supported by stromal tissue, fibroblasts and immune cells

Question 6

choriocapillaris

Answer 6

specialised capillary bed
single layer of capillaries
fenestrated vessels
densest closest to macula
supports retinal outer segments
unique to the choroid

Question 7

bruchs membrane

Answer 7

innermost layer adjacent to retina
modified connective tissue
5 layers

Question 8

what are the layers of bruchs membrane

Answer 8

basement membrane of choriocapillaris
outer collagenous layer
elastic layer
inner collagenous layer
basement membrane of RPE

Question 9

what are the three main functions of bruchs membrane

Answer 9

1. regulating the diffusion of molecules between the choroids and the RPE
2. provides physical support for the RPE cell adhesion, migration and differentiation
3. acts as a division barrier so it restricts choroidal and retinal cellular migration and controls that