Eye - Intro Flashcards
What are the 3 layers of the eyeball?
fibrous coat
vascular coat
sensory coat
What fibre makes up the outermost layer of the eye?
collagen
fibrous coat
What are the 2 parts of the fibrous coat?
cornea and sclera
Name A and B and what layer of the eye they make up?
A = cornea
B = sclera
What does the sclera make up of the eye?
The posterior 5/6 of the fibrous coat (white part)
What portion of the eye does the cornea make up?
Anterior 1/6, transparent
What makes up the vascular coat of the eye?
Iris
Ciliary body
Choroid
Name parts A-C and what part of the eye they belong to?
A = iris
B= ciliary body
C = choroid
Belong to the vascular layer of the eye
What part of the eye gives the colour to the eye?
Iris, behind the cornea
Where is the iris most deficient?
At the pupil
What part makes up the sensory coat?
Retina
What is A and what part of the eye does it belong?
Retina
Belongs to the sensory coat
What is different about the collagen fibres if the cornea and the sclera?
The sclera has collagen fibres of different diameters arranged irregularly, giving white opaque appearance
Cornea has fine uniform collagen fibres, allows light to pass through it and is transparent
What is the role of the iris?
Control the diameter of the pupil and thereby controls the amount of light rays entering the eyeball
What comes off of the ciliary body? What does it produce?
Suspensary ligaments/zonules, help to suspend the crystalline lense
Produces aqueous humor, fills all the space in front of the lense
What is the function of the choroid?
Supplies blood to outer layers if retina
What part of the eye produces the aqueous humor?
The ciliary body
What is role of the retina?
Has light sensitive rods and cones which enables us to see
What 3 structures fill the eyeball?
A= aqueous humor in anterior segment
B= lense
C = vitreous humor in posterior segment
What is the role of the vitreous humor?
A gel which helps to push the retina back against the choroid
and prevent it from getting detached
Is the crystalline lense opaque or transparent?
Transparent
What is the structure of the crystalline lense?
Transparent
Crystalline biconvex structure
Suspended in zonules from ciliary body
It can change shake
What are the boundaries of the anterior and posterior segments of the eye?
Anterior = everything in front of the lense
Posterior = behind the lense
What does the anterior segment of the eye contain?
Watery fluid called aqueous humor
What does the posterior segment of the eye contain?
Filled with a gel called vitreous humor
What is the role of the aqueous humor?
Maintain intratubular pressure
What is the role of the vitreous humor?
Helps cushion the retina
What can the anterior segment be subdivided into?
Anterior and posterior chambers
Where is the anterior and posterior chamber? (of the anyerior chamber)
Anterior chamber informs of iris
Posterior chamber behind iris but infront of lense
Name structures A - I
A = cornea
B = sclera
C = choroid
D = ciliary body
E = iris
F = posterior chamber
G = anterior chamber
H = suspensory ligaments
I = lense
What do the red arrows show here?
Path of the aqueous humor
Describe the pathway of the aqueous humor
Produced by the ciliary body, flows into the posterior chamber out through the pupil, to the anterior chamber, gets reabsorbed into a little canal
What canal does the aqueous humor flow through?
Canal of schlemm’s
What is the arrow pointing to?
Edge of the iris and the end of the sclera and start of cornea
The angle of the anterior chamber
What is significant about the angle of the anterior chamber
Things that might push the iris up towards the angle of the anterior chamber
Occlude the. Able of the anterior chamber and the aqueous humor can no longer access the canal of schlemm and get drained
What is the arrow pointing to and what does it do?
Trabecular meshwork
Aqueous humor flows out of the eye, into the Cana, of schlemm’s
Why can’t you see the ciliary body and choroid and retina?
The sclera is opaque
What can you see through the pupil?
Lense
If a patient has chateracs, how does the lense appear?
The lense has started to opacify, you will see a white or yellowish glow through the pupil of the eye
