Midterm Flashcards
What is the photoreceptive structure at the back of the eye?
Retina
What muscles control the thickness of the lens?
Ciliary muscle
T or F
The lens needs to become thinner, or less convos as focus is drawn closer to the eye.
False
This is describing when focus is brought on distant objects.
The term for adaptation of focus is?
Accommodation
Name the three coats of the eyeball
- External fibrous scleral coat
- Middle vascular coat of the choroid *sometimes called the uveal tract
- Inner retinal coat
The sclera covers approximately what proportion of the eye?
5/6
T or F
The sclera is continuous with the cornea
True
What is another name for the scleral corneal junction?
Limbus
Where does the cornea derive it’s nutrition?
Vessels of the limbus
the aqueous and tears
What is the name of the area where the eyelids join at each side and form angles?
Lateral and medial Canthus
What is the function of the lacrimal caruncle?
Helps direct drainage of the tears
The entire area at the medial canthus is generally referred to as?
Lacrimal Lake
What is the function of the Tarsal glands?
They are modified sebaceous glands that secrete an oily substance that mixes with the tear film layer and helps to retard moisture evaporation. The mixture also helps break the surface tension of the tears.
T or F
The tarsal muscle only receives parasympathetic stimulation
False
Sympathetic
**tarsal muscles are attached to the top of the tarsal plate
What lays in front of the Tarsal Glands?
Ciliary glands
What is the function of the ciliary glands?
These are also modified sebaceous glands which secrete an oily substance that helps give body to the cilia and allow them to remain moisture retardant.
What makes up the Ciliary Body?
The Ciliary Muscle
The Ciliary Process
What secretes aqueous fluid or humour?
Ciliary process
The Ciliary muscle is compromised of three types of fibres. Name the different fibre types that make up the ciliary muscle…
Circular Fibres
Meridianal Fibers
Radial Fibres
What is the name of the highly specialized area of sensory epithelium of the retina?
Macula
What holds the lens to the ciliary body?
Suspensory Ligaments
T or F
The circular fibres of the ciliary muscle are parasympathetically controlled
True
**Radial and Meridianal are sympathetically controlled
What is aqueous humour?
It fills the anterior cavity and is actually the result of finely filtered blood that contains no RBC
T or F
The aqueous humour is secreated into the anterior cavity of the eye
False
Secreted in the posterior. The aqueous then passes through the pupil into the anterior chamber of the anterior cavity.
What is the name of the structure that drains the aqueous humour?
Canal of Schlemm
Canal of Schlemm will return the fluid to the venous blood by what vein?
Anterior ciliary vein.
The condition of increased intraocular pressure is?
Glaucoma
T or F
The vitreous body or vitreous humour is located in the posterior cavity of the eye
True
What is Vitreous composed of?
99% water
1% collagen and hyaluronic acid
What is the conjunctiva?
A thin transparent membrane that covers the anterior sclera and the inside back of the eyelid.
What is the name of the portion of the conjunctiva that covers sclera?
Bulbar conjunctiva
What is the name of the conjunctiva that covers the inside back of the eyelid?
Palpebral Conjunctiva