Term
| Fluid in the anterior & posterior chambers of the eyesis called _____ and is produced by _____. |
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Definition
aqueous humor
the ciliary body |
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Term
| The _____ chamber lies caudal to the lens. |
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Definition
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Term
| The lens is essentially held in the eye because it is attached to _____. |
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Definition
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Term
| The iris is an extension of the _____. |
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Definition
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Term
| The pupil is a break in the path of the _____. |
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Definition
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Term
| The parts of the eye that make up the fibrous coat (or fibrous tunic) are _____. |
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Definition
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Term
| The parts of the eye that make up the vascular tunic are _____. |
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Definition
| iris, ciliary body & choroid |
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Term
| The cornea is an extension of the _____. |
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Definition
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Term
| At the back of the eye, the layers (from rostral to caudal) are _____. |
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Definition
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Term
| The importance of the choroid is _____. |
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Definition
| to prevent multiple photons from reflecting off the sclera and creating multiple impulses (and double vision) |
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Term
| The _____ is an area on the choroid that is not black and allows for "night vision." |
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Definition
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Term
| There are _____ main muscles (or muscle groups) in the eye. |
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Definition
3
rectus mm.
oblique mm.
retractor bulbi m. |
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Term
| The are _____ rectus mm. and they are responsible for _____. |
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Definition
four: dorsal, ventral, medial, lateral
pulling the eyeball (pupil) dorsally, ventrally, medially, laterally |
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Term
| There are _____ oblique mm. and they are responsible for _____. |
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Definition
two: dorsal, ventral
rotation of the eye medial dorsally or medial ventrally |
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Term
| The retractor bulbi m. is made up of _____ pieces and it is responsible for _____. |
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Definition
four
pulling the eyeball caudally into the socket (when irritated, etc) |
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Term
| What is the "phrase" used to remember which cranial nerves innervate which eye muscles? |
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Definition
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Term
| A dog in your clinic presents with a medially-facing pupil. Which muscle is not functioning properly? Damage to which cranial nerve has caused this? Damage to this nerve also causes disfunction in what other muscle(s)? |
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Definition
lateral rectus m.
cranial nerve 6
the retractor bulbi m. is nonfunctional |
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Term
| A dog presents in your clinic with a laterally facing pupil. What muscle is not functioning? Which cranial nerve has been damaged to cause this? Also, what other problems might the dog have due to nerve damage? |
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Definition
the medial rectus m. is not working
cranial nerve 3 has been damaged
the dorsal & ventral rectus mm. are not working, but their actions "cancel" each other out
also, the ventral oblique m. will be non-functional; however, with a round, pupiled dog, rotation of the eyeball is not readily noticeable. |
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Term
| A dog is presented to you with known cranial nerve damage. However, upon an eye exam, the pupils are positioned & sized normally. Which nerve has been damaged and why can't isn't the result visible? |
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Definition
cranial nerve 4 is damaged
damaged to CN 4 results in rotation of the eyeball; however, in a dog, you can't see this rotation because the pupil is round |
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