1 Major Ocular Structures Flashcards
What are the three layers that make up the eye?
outer - fibrous tunic
middle - vascular tunic
inner - nervous tunic
The outer layer of the eye, or fibrous tunic, contains what two things?
The Sclera
The Cornea
The middle layer of the eye called the vascular tunic, which is responsible for nourishment, consists of what three things?
The Iris
The Choroid
The Ciliary Body
The inner layer of the eye, or nervous tunic, contains what?
The retina made up of photoreceptors and neurons
How many fluid filled chambers are there?
3
What do you call the volume between the cornea and the iris?
anterior chamber
What do you call the volume between the iris and the lens?
Posterior Chamber
What do you call the fluid in the Anterior and Posterior Chamber?
Aqueous Humor
What is the ciliary body responsible for?
produces aqueous humor, a watery fluid, which maintains pressure and provides nutrients to the lens and cornea
Where is Aqueous Humor continually drained through
The Canal of Schlemm
Where is the vitreous chamber and how big is it
Between the retina and the lens and is about 4/5 of the eye
A gel like substance in the vitreous chamber that maintains the shape of the eye
Vitreous Humor
Where does light enter the eye?
The transparent and dome-shaped cornea
What is the outermost layer of the cornea and what does it rest on?
Epithelium and it rests on Bowman’s Membrane
What are the abilities of the Epithelium and Bowman’s Membrane?
The Epithelium regenerates quickly and Bowman’s Membrane is tough and difficult to penetrate. The protect the cornea from injury
What is the innermost layer of the cornea called and what does it rest on?
Endothelium and it rests on Descemet’s Membrane
What does the endothelium do?
Removes water from the Cornea helping to keep it clear
What is the middle layer of the cornea called?
Stroma - makes up 90% of cornea thickness
What are the 5 layers of the cornea from outside to inside?
Epithelium, Bowman’s Membrane,
After light passes through the cornea, what does it hit next?
pupil
What is the colored part of the eye called?
Iris
What controls how much light the pupil lets in?
The Iris
What are the two muscles in the Iris called?
The Dilator and the Sphincter
What muscles opens the Iris and which muscle closes it
The Dilator opens and the Sphincter closes
