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anatomy of the eye
Terms in this set (36)
-produces, collects, & drains fluid
- lubricates, cleanses and moistens eye, reduces eyelid friction, defends against microbes, oxygenates and nourished cornea
this fluid includes water, Na+, antibodies, & lysozyme (antibacterial enzyme)
produces fluid and secretes it through ducts
posterior cavity is ___ the lens & contains ____ humor
anterior cavity is ___ the lens & contains ___ humor
in front of; aqueous
the wall of the eye is formed by three tunics called:
fibrous tunic, vascular tunic, retina tunic
includes the sclera, cornea, & limbus
the sclera is composed of what kind of tissue?
dense irregular c.t
fxn of the sclera?
provides eye shape & protects internal components
the inner layer of the cornea has _______; middle layer has _____; outer layer has____.
simple squamous epithelium; collagen; stratified squamous epithelium
-middle layer with many vessels
-houses blood vessels, lymph vessels, intrinsic muscles
the vascular tunic includes which structures?
choroid, ciliary body, iris and pupil
what produces aqueous humor?
which structure gives the eye color?
what divides the anterior and posterior chambers ?
which structure controls the light going into the eye?
circular fibers constrict pupil with parasympathetic nervous system activity
sphincter pupillae muscle
organized smooth muscle dilates pupil with sympathetic nervous system
dilator pupillae muscle
the ability to alter pupils size in response to light
retina tunic includes ___
the pigmented layer & neural layer
-has a lot of melanin (dark pigment)
- is attatched to choroid
-provides vitamin A for photoreceptors
-absorb stray light to prevent light scatter
-houses photoreceptors & associated neurons
-receives light and converts it to nerve signals
T/F: ganglion cells react to light
FALSE (ganglion cells dont react to light; photoreceptors do)
does the optic disc have any photoreceptors?
where is the highest proportion of cones; where theres hardly any rods?
area of sharpest vision
-transparent gelatinous fluid
-permanent fluid first produced in embryonic development
-helps eye maintain shape
-transparent watery fluid
-continuously produced by ciliary processes
-nourishes and oxygenates lens and inner cornea
drainage failure of aqueous humor can lead to ____
the aqueous humor drains from the anterior chamber to the ____ then to nearby veins
sclera venous sinus
rods are everywhere except in the
fovea & macula lutea
cones are concentrated at ___
which photoreceptor allows color vision?
cones have one-to-one relationship with ____ cells & ___ cells
_____ results in a sharp image but only possible in bright light
____ results in sensitivity to dim light but a blurry image
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