Lecture 20: Eye Histology Flashcards
What is the function of the eyelid?
Protects the eye
What is the function of tarsal glands?
Special sebaceous glands that produce meibum to prevent evaporation of of tears
What can blocked tarsal glands lead to?
Chalazion
Lump on eyelid
What can blocked sebaceous glands in the eyelashes lead to?
Stye
Near eyelash follicles
What do lacrimal glands do?
Produce tears
Made from tubuloacinar serous glands
What is the conjunctiva that lines the outermost part of the eyeball?
Bulbar (ocular) Conjunctiva
What is the conjunctiva that lines the innermost part of the eyelids?
Palpebral Conjunctiva
What is the anterior chamber between?
Between Cornea and Iris
Filled with aqueous humor
What is the posterior chamber between?
Between Iris/Pupil and Lens (small)
What is vitreous chamber between?
Lens and neural retina
Filled with vitreous humor to maintain shape
What structures compose the fibrous (external) layer of the eye?
- Sclera: supports eye and protects internal structure
- Cornea: protects anterior surface of eye and refracts light
What are the five layers of the cornea, anterior to posterior?
- Corneal Epithelium: nonkeratinized statified squamous
- Bowman’s Membrane: anterior basement membrane
- Corneal Stroma: avuscular and 60 layers thick
- Descemet’s Membrane: posterior basement membrane
- Corneal Endothelium: faces anterior chamber
What is found in between the basement membrane and corneal epithelium?
Free Nerve Endings
What structures compose the vascular (middle) layer of the eye?
- Choroid: supplies nourishment to retina
-
Ciliary Body
- Ciliary Muscle: manages accomodation
- Ciliary Processes: secretes aqueous humor and and forms suspensory ligaments oflens
- Iris: controls light entering eye
What are the layers of the lens?
- Capsule
- Subcapsular Lens Epithelium
- Lens Fibers