Anatomy - The Special Senses - The Eye Flashcards
What is the transparent outer layer of the eye called?
The cornea
What is the coloured part of the eye that regulates the amount of the light entering it?
The iris
What is the opening in centre of the iris know as?
The pupil
What muscles work when there is a lot of eye trying to enter into the pupil?
The circular smooth muscle
What eye muscle works when in a dark room?
The radial smooth muscle
What are the three layers of the visceral layer called?
The choroid, iris, and the ciliary body
Which is bigger?
The posterior chamber or the anterior chamber?
The anterior chamber
Where is the posterior chamber located?
Between the iris and the lens
Where is the anterior chamber located?
In front of the lens.
What happens to the zonular fibres when you are trying to see up close?
They become thick
Does that conjunctiva create fluid? If so, how much?
Yes and only a little bit.
What do the zonular fibres do when you are trying to see far away?
They become thin.
The nerve that carriers visual information to the brain is called?
The optic nerve.
What colour is the retina!?
It is transparent
The vascular layer between the retina and the sclera is called?
Choroid. The tapetum lucitum layer
What humour is connected to the lens?
The aqueous humour.
What are the eyelashes called?
Cillia
What does the tapetum lucitum allow for?
Night vision
What are the three layers of the eye?
Outer layer: fibrous layer. Made of collagen fibres.
Middle layer: vascular layer. Has three parts.
The inner layer: the nervous layer.
What is the junction between the cornea and sclera called?
a. Limbus b. Choroid. c. Perilymph
The limbus
True or false.
The vascular layer has no blood vessels.
False. They have a lot of blood vessels.
True or false.
The nervous layer is only found at the back of the eye.
True
Is the retina sensitive?
Yes
True or false.
The lens is not transparent
False. The lens is transparent
True or false.
The aqueous chamber is always flowing
True
True or false.
The optic disc can create images
False
What is special about the optic disc?
It has no rods or cones - therefore no image can be formed here. The blood vessels and the optic nerve come into the eye through here.
True or false.
The fovea and macula can create images.
True
What is true about the fovea and macula?
It has a high concentration of rods and cones. Provides accurate and clear vision.
What is the optic disc known as?
The blind spot
True or false.
The cones allow you to only see black and white
False. They allow you to see colour
True or false.
The rods have no sensitivity to colour
True
What are the two parts of the conjunctiva called?
The bulbar and the palpebral conjunctiva.
What is the lacrimal gland known as?
The tear gland
Where do the fluids from the eye drain? Why is it located on the bottom eyelid?
The lacrimal puncta. It is located on the bottom because it needs to connect to the lacrimal sac and nasolacrimal duct.
Where are the meibomian glands located?
At the base of the eyelashes
What are the components of the lacrimal apparatus?
Lacrimal glands, lacrimal puncta, lacrimal sac, and the nasolacrimal duct.
What do meibonmian glands produce?
They produce oil and sebum.
What is the function of the meibomian glands?
Keep the tears from evaporating and/or falling out.
What kind of glands are meibomian glands?
A) merocrine. B) apocrine. C) holocrine
C) halocrine
What type of glands are the lacrimal glands?
A) merocrine. B) apocrine. C) holocrine
A) merocrine
What is conjunctivitis commonly caused from?
Bacteria.
What is the colour of the eye known as?
The choroid.
Where is the vitreous humor?
Between the lens and the retina.
What kind of substance is the vitreous humor?
Gel-like substance.
