The choroid

how many tunics does the eye have

3

what are the names of the tunics of the eye

1. fibrous

2. vascular

3. neural

which parts of the eye make up the fibrous tunic

cornea and the sclera

which parts of the eye make up the vascular tunic

iris, choroid , ciliary body

which parts of the eye make up the neural tunic

retina

what are the functions of the choroid

1. main blood supply for the retina

2. maintenance of ocular temperature

3. prevents stray light reflecting inside the eye

what is posterior to the choroid

optic nerve

what is anterior to the choroid

ora sirata

what % of eye blood flow is due to choroidal circulation

85

what are the structural componenets of the choroid

1. loose connective tissue

2. melanin

what does the loose connective tissue contain

1. blood vessels

2. loose strands of collagen

3. fibroblasts

what are the layers of the choroid

1. suprachoroidal lamina

2. choroidal stroma

3. choriocapillaris

4. bruchs membrane

what are the blood vessels in the choroid specialised to do

exchange nutrients to the outer retina

what are the types of blood vessels in the choroid

1. fenestrations

2. larger than normal lumen

The choroid can _______ blood and __________ blood

supply , drain

what is the process of drainage of blood in the choroid

ophthalmic veins —→ vortex veins —→ ophthalmic veins

what age related changes effect the choroid

1. macular degeneration

2. thickening of the Bruchs membrane

3. less efficient exchange of nutrients between the bruchs membrane and the retina