SENSE ORGAN THE EYES Flashcards
What surrounds and cushions the eye?
Periorbital fascia and fat
What protects the eye and keeps its surface moist?
Eyelids and conjunctivae
What keeps the eye’s surface moist and provides the first barrier to infection?
Lacrimal apparatus
What cells form the myelin of the optic nerve?
Oligodendroglial cells
What is the homologous structure of the vascular and fibrous tunics surrounding the optic nerve?
Meninges
What is the space within the optic nerve continuous with the brain’s subarachnoid space called?
Intervaginal space
What are the layers of the fibrous tunic?
Collagenous and elastic tissue, fibrocytes
What percentage of the eye’s surface does the sclera cover?
75%
What is the transparent part of the fibrous tunic called?
Cornea
What percentage of the fibrous tunic does the cornea cover?
25%
What is the border between the sclera and cornea known as?
Limbus corneae
What is the alternate name for the vascular tunic?
Uvea
What is the function of the choroid’s tapetum lucidum?
Increases light intensity under low-light situations
Which part of the vascular tunic suspends the lens?
Ciliary body
Which muscles originate on the sclera and attach to the ciliary body?
Ciliary muscles
What is the border between the sclera and cornea known as?
Limbus corneae
What is the alternate name for the vascular tunic?
Uvea
What is the function of the choroid’s tapetum lucidum?
Increases light intensity under low-light situations
Which part of the vascular tunic suspends the lens?
Ciliary body
Which muscles originate on the sclera and attach to the ciliary body?
Ciliary muscles