Exam 3 – Lecture 31: Eye Flashcards
What is the eye?
An outgrowth of the nervous system in combination with ectoderm
What are functions of the eye?
Sight/vision Locomotion Nutrition Defense Seasonality/reproduction
What are the tunics of the eye?
Fibrous
Vascular
Nervous
What is the fibrous tunic made of?
Fibrous dense connective tissue
What is the fibrous layer?
Corneoclera
What is the vascular layer?
Uvea
What is the nervous layer?
Retina
What are the chambers of the eye?
Anterior
Posterior
Vitreous
What is the anterior chamber?
Cornea to iris
Aqueous humor
What is the posterior chamber?
Iris to lens
Aqueous humor
What is the vitreous chamber?
Behind lens
Vitreous humor
Keeps the eye distended
Describe the cornea of the fibrous tunic
Corneal epithelium Bowman's membrane Stroma Descemet's membrane Corneal endothelium
What is corneal edema?
When the cornea is thickened and vision is impaired
What makes up most of the globe of the eye?
Sclera
What kind of tissue is sclera?
Dense fibrous connective tissue
Describe the iris of the vascular tunic
Forms the border between anterior and posterior chambers
Pigmented epithelium
Smooth muscle
Describe the ciliary body
Between the iris and choroid
Zonular fibers attach to the lens
Form blood-aqueous barrier
Secret aqueous humor
What does smooth muscle the iris form?
Pupil
Describe the choroid of the uvea
Rear portion
Between retina and sclera
What is the lens attached to?
The uvea, but does not have blood supply
Describe the lens
Transparent Avascular Has a capsule Subscapular epithelium Fibers that are mostly collagen and water
What is it called the the lens is not transparent?
Cataract
How many layers are there in the retina?
5 or 7
Describe the retina
Optic disc
Has a tapetum, which is the reflective portion
