Shared Flashcard Set

Details

The Eye
n/a
19
Anatomy
Professional
11/19/2011

Additional Anatomy Flashcards

 


 

Cards

Term
Fluid in the anterior & posterior chambers of the eyesis called _____ and is produced by _____.
Definition

aqueous humor

the ciliary body

Term
The _____ chamber lies caudal to the lens.
Definition
vitreous
Term
The lens is essentially held in the eye because it is attached to _____.
Definition
the ciliary body
Term
The iris is an extension of the _____.
Definition
choroid layer
Term
The pupil is a break in the path of the _____.
Definition
choroid
Term
The parts of the eye that make up the fibrous coat (or fibrous tunic) are _____.
Definition
cornea & sclera
Term
The parts of the eye that make up the vascular tunic are _____.
Definition
iris, ciliary body & choroid
Term
The cornea is an extension of the _____.
Definition
sclera
Term
At the back of the eye, the layers (from rostral to caudal) are _____.
Definition
retina
choroid
sclera
Term
The importance of the choroid is _____.
Definition
to prevent multiple photons from reflecting off the sclera and creating multiple impulses (and double vision)
Term
The _____ is an area on the choroid that is not black and allows for "night vision."
Definition
tapetum lucidum
Term
There are _____ main muscles (or muscle groups) in the eye.
Definition
3
rectus mm.
oblique mm.
retractor bulbi m.
Term
The are _____ rectus mm. and they are responsible for _____.
Definition
four: dorsal, ventral, medial, lateral
pulling the eyeball (pupil) dorsally, ventrally, medially, laterally
Term
There are _____ oblique mm. and they are responsible for _____.
Definition
two: dorsal, ventral
rotation of the eye medial dorsally or medial ventrally
Term
The retractor bulbi m. is made up of _____ pieces and it is responsible for _____.
Definition
four
pulling the eyeball caudally into the socket (when irritated, etc)
Term
What is the "phrase" used to remember which cranial nerves innervate which eye muscles?
Definition
LR6Do4Rest3
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)?
Definition

lateral rectus m.

cranial nerve 6

the retractor bulbi m. is nonfunctional

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?
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.
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?
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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