Eye Flashcards
(126 cards)
What color is the optic disc?
White/yellow
What is the nerve supply to the eyeball?
Branches of the nasocillary nerve of the ophthalmic division of the trigeminal
Sympathetic from cavernous plexus
Parasympathetic fibers form ciliary ganglion
What modified sebaceous gland secretes an oily substance that covers tears and reduced evaporation of them?
Tarsal glands
What is the colored part of the eye?
Iris
What structure of the eye does the neural crest mesenchyme give rise to?
Fibrous coats (sclera)
What germ layer gives rise to the lens?
Surface ectoderm
Lens gets harder with age making near vision harder. What’s the name for this>
Presbyopia
There are many tiny ________ in the _______ that allow structures to pass through (within the eye)
Openings, sclera
What is the points where the optic nerve attaches to the eyeball?
Optic disc
What arteries in the eye dont have an accompanying venous supply?
Short ciliary arteries (6-12)
Where do the 6-8 anterior ciliary arteries arch?
Over (3-4) and under (3-4) the eyeball
What maintains the shape if the pressure inside eye increases?
Sclera
One long ____ _____ artery on each side (medial and lateral) of the eyeball and run between the sclera and choroid
Posterior ciliary A.
What is the white part of the eye called?
Sclera
What does increasing the convexity of the lens do?
Allows us to see near vision
What does the external plexiform layer contain?
Rods and cones synapsing with bipolar cells
What nerve does the central retinal artery travel with?
Optic N
The cornea consists of ____ layers. What are they from anterior to posterior?
5
- Corneal epithelium
- Anterior limiting Lamina
- Substantia propria
- Posterior limiting Lamina
- Endothelium
What two structures of the eye does the neuroectoderm give rise to?
Retina
Pigmented structures
What does the lens separate?
Anterior segment from posterior segment
What are cataracts?
Lens becomes less transparent
___-___, _____ _____ arteries enter the eyeball on the posterior surface forming a ring around the optic N
6-12 short ciliary arteries
The fovea centralis is in the middle of what structure?
Macula lutea
What has fibers that are arranges circumferentially that constrict the pupil?
Sphincter pupillae