Anatomy Worksheet Flashcards
What are the two parts of the first tunic?
The sclera and the cornea
What is the thickest layer of the cornea?
Stroma
What is the limbus?
The junction between the sclera and the cornea
What is axial length of the average human eye?
26.5 mm: Based upon a radius of 12 mm giving a diameter of the globe of 24mm with a 2.5mm protrusion of the cornea.
What muscle controls the movement of the eyebrows?
Frontalis muscle
Name two functions of the eyelids.
Protection (Closing), distributing tear film over cornea and sclera, provide oxygen through blood vessels during sleep (closed eye)
What is another name for the eyelids?
Palpebrae
What is the primary function of the iris?
To control the amount of light that enters the eye
Which muscle relaxes and allows the lid to droop when a person is tired?
Muller’s Muscle
Name the five layers of the cornea, from outermost to innermost in order:
Epithelium, Bowman’s layers, Stroma, Descemet’s membrane, Endothelium
What is the power of the cornea?
43 diopters
What do humans have more of, rods or cones?
Rods
Why are rhodopsin and iodopsin important?
Rhodopsin in rods provides night vision and iodopsin in cones provide color vision
Retinal photoreceptors are sensitive to wavelengths between _____ nanometers?
380nm and 750nm
Which area of the retina is responsible for fine detail vision?
The fovea - macula
Where is the optic disc located?
At the point where the optic nerve leaves the eye
Which layer of the tear film contains the nutrients and antibiotic properties that feed and protect the eye?
Aqueous
What is the term for the eyelids turning inward?
Entropion
What is the term for drooping eyelids
Ptosis
How many muscles control the movement of the eyeball?
Six
Name the 4 straight muscles that control movement of the eye?
Medial rectus, lateral rectus, superior rectus, inferior rectus
Name the 2 slanted muscles that control movement of the eye?
Superior oblique, inferior oblique
Where does visual fusion occur?
In the brain
What is the condition whereby a muscle imbalance leads to loss of vision due to lack of fusion?
Amblyopia (Lazy eye)
