Eye 1

Question 1

Development of the eye

Answer 1

• ectoderm invaginates = neural tube
• optic vesicle –> neural tube bulges out
• future neural retina invaginates
• lens + cornea develop from ectoderm

Question 2

Tunics of the eye

Answer 2

Corneoscleral coat (cornea, sclera – protect + shape)
Uvea (choroid, ciliary body, iris)
Retina (macula, fovea)

Question 3

Choroid

Answer 3

• Bruch’s membrane
• Choriocapillaris = fenestrated capillaries (to retina)
• Choroidal stroma = vessels, melanocytes

Question 4

Ciliary Body

Answer 4

• ciliary muscle (radial and circular)
• ciliary processes
• continuation of choroid –> Accommodation
• inner = neural epithelium
• outer = retinal pigment epithelium

Question 5

Iris

Answer 5

• separates anterior + posterior chambers — Adaptation

anterior limiting membrane (fenestrated)
stroma (nerves + melanocytes)
muscle layer (dilator = sympathetic, sphincter = para)
posterior epithelium (neural/retinal pigment epithelium)

Question 6

Three chambers of the eye

Answer 6

Anterior chamber = cornea + lens (aqueous humor)
Posterior chamber = iris + lens (aqueous humor)
Vitreous cavity = behind lens (vitreous humor)

Question 7

Pathway of Aqueous Humor

Answer 7

• produced by epithelium of ciliary processes
• posterior –> anterior –> trabecular meshwork
• Canal of Schlemm –> aqueous veins

Question 8

Cornea

Answer 8

• epithelium
• Bowman’s membrane (no regenerate, keep pathogens)
• stroma (fibroblast, no vessels)
• descemet’s membrane
• endothelium

Question 9

Lens

Answer 9

• zonula fibers attaches lens to ciliary body
• anterior lens epithelium
• cortical lens cell fibers
• nuclear lens cell fibers (ghost cell nuclei)