The Eye
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42 terms
Terms | Definitions |
|---|---|
 Fibrous tunic | outer coat of the eyeball |
| The fibrous tunic is composed of: | 1. posterior choroid 2. anterior ciliary body 3. iris |
| The vascular tunic (posterior choroid, anterior ciliary body and iris) are collectively called: | The Uveal Tract |
| Choroid carries: | blood vessels for the eyeball contains large anounts of pigment (preventing internal reflection of light) |
| Ciliary body | a thickened structure containing smmoth muscle |
| Ciliary body muscles serve to: | change the sape of the lens allowing changes in focal distance of the eye |
| The iris contains: | pigment responsible for the color of the eye |
| The hole in the iris is the : | pupil |
| The pupil permits: | light to enter the eye |
| Contraction of the radial muscle: | dialates the pupil |
| Contraction of the circular muscle: | constricts the pupil |
| Radial muscles and circular muscles regulate: | the amount of light entering the eye |
| The nervous tunic is the: | retina |
| The retina is the: | most innermost tunic of the eye |
| The retina translates: | light wabes into neural impulses |
| The retina contains: | several layers of nerve cells and their processes |
| There are two types of receptors in the retina: | rods cones |
| Rods are for: | vision in dim light |
| Cones are for: | daytime or color vision |
| Cones are most densly concentrated in: | the central fovea ( a small depression in the center of the macula lutea) |
| The macula lutea or yellow spot is: | in the central part of the retina |
| The fovea is the area of: | sharpest vision because of the highest concentration of cones |
| Rods are absent in the: | fovea and macula |
| Rods increase in density toward the: | periphery of the retina |
| The optic disk is where the: | optic nerve exits the eye |
| The optic disks is the: | weak spot of the eye (blind spot) |
| The optic disk is a blind spot because: | it does not contain photoreceptors and light focused on it cannot be detected. |
| The aqueous humor is the: | fluid filling the anterior chamber of the eyeball |
| The aqueous humor maintains: | intraocular pressure provides nourishment maintains the shape of the eyeball |
| The vitreous humor maintains: | the spherical shape of the eye supports the inner structures |
| The vitreous humor fills the: | posterior chamber of the eye |
| The vitreous humor is a: | jellylike substance that fills the posterior chamber of the eye and maintains the spherical shape of the eyeball |
| The vitreous humor and the adequous humor are: | transparent allowing light to pass through the eye to the retina. |
| The lens is: | a transparent biconvex crystaline body enclosed in an elastic capsule held by supensory ligiaments |
| The shape of the lens changes to: | focus the image |
| The eyeball is protected from the external world by the: | eyelid |
| The eyelid contains a: | thin protective layer of epeithelium (the conjunctiva) |
| A thin protective layer of epethelium: | the conjunctiva |
| The eyelashes protect the eye from: | forein particles |
| The lacrimal gland produces a secretion called: | tears |
| Tears contain: | lysozyme and muramidase |
| Tears destroy: | pathogens |
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