Lecture 20: Eye Histology

Question 1

What is the function of the eyelid?

Answer 1

Protect the eye

Question 2

What is the function of tarsal glands?

Answer 2

Special sebaceous glands that produce meibum to prevent evaporation of of tears

Question 3

What can blocked tarsal glands lead to?

Answer 3

Chalazion

Question 4

What can blocked sebaceous glands in the eyelashes lead to?

Answer 4

Stye

Question 5

What do lacrimal glands do?

Answer 5

Produce tears

Question 6

What is the conjunctiva that lines the innermost part of the eyelids?

Answer 6

Palpebral Conjunctiva

Question 7

What is the conjunctiva that lines the outermost part of the eyeball?

Answer 7

Bulbar (ocular) Conjunctiva

Question 8

What is the anterior chamber between?

Answer 8

Between Cornea and Iris/Pupil (huge)

Question 9

What is the posterior chamber between?

Answer 9

Between Iris/Pupil and Lens (small)

Question 10

What is vitreous chamber between?

Answer 10

Lens and neural retina

Question 11

What structures compose the fibrous (external) layer of the eye?

Answer 11

Sclera: supports eye and protects internal structure
Cornea: protects anterior surface of eye and refracts light

Question 12

What are the five layers of the cornea anterior to posterior?

Answer 12

1. Corneal Epithelium
2. Bowman’s Membrane
3. Corneal Stroma
4. Descemet’s Membrane
5. Corneal Endothelium

Question 13

What structures compose the vascular (middle) layer of the eye?

Answer 13

Choroid: supplies nourishment to retina
Ciliary Body: holds suspensory ligaments that attach to the lens
Iris: controls light entering eye

Question 14

What structures compose the retina (internal) layer of the eye?

Answer 14

Pigmented layer: absorbs light

Neural layer: where light is converted in nerve signals