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An1107- Mod 4 > Orbit > Flashcards

Orbit Flashcards

1
Q

what is the orbital axis

A

from center of cornea to retinal center

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2
Q

walls of the orbit

A

sup- frontal bone, lesser wing

lat- greater wing, zygomatic

inf- maxilla, zygomatic

med- body of sphenoid, lacrimal

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3
Q

what is the content of the optic cannal and where is located

A

located within the common tendinous ring\

optic nerve and opthalmic artery a

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4
Q

muscles that attach to the common tendinous ring

A

superior rectus
medial rectus
lateral rectus
inferior rectus

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5
Q

nerves that run thru the superior orbital fissue inside common tendinous ring

A

Occulomotor (sup+inf)
Nasocillary
-abducens
-optic

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6
Q

Nerves that run thru superior orbital fissure outside common tendinous ring

A
  • frontal n
  • lacrimal n
  • trochlear n
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7
Q

The eye post is ivested in what and what is behind that

A

bulbar fascia with retrobulbar fascia behind it

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8
Q

what does the palpebral conjunctiva produce

A

produce fluid to lubricate the eyelid

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9
Q

what is the most sup muscle in the eye, inn

A

Levator palpebrae sup- elevates upper eyelid- styriated inn by CN3, smooth sympathetic

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10
Q

what are the 3 parts of the eye

A
  1. Capsul
  2. Nucleus
  3. Fundus
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11
Q

parts of the capsul

A
  1. sclera- external layer
  2. Cornea
  3. Choroid- supply of blood/nutrients
  4. ciliary body- on either side of lens
  5. retina
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12
Q

Parts of the nucleus

A
  1. lens- can change shape

2. vitrous body

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13
Q

Parts of fundus

A
  1. Optic disk and fovea
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14
Q

What does vit A deficiancy cause

A

deficiency of photpigments required for night vision

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15
Q

what part of the eye does a visual acuity test test

A

macular function (fovea)

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16
Q

what is the light reflex and what muscles do it

A

sphincter pupilae muscles are inn by parasympathetic n that constrict the eye and dialater pupilae dialate eye inn by sympathetic

17
Q

Light relex test and what does it indicate (for same eye and other eye)

A

normal- both pupils constrict

same eye fails to constrict- indicates optic n injury

other eye fails to constrict- loss of CN3

18
Q

What is the accomodation reflex

A

with parasympathetic inn by cn3 the cillary m will contract and the lens contricts for near vision

-lose this after 40 ish due to lens losing elasticity

19
Q

movements of the eye

A

Adduction/Abduction
Elevaton/depression
Extorsion/intortion

20
Q

where does the sup oblique m run

A

on med portion of orbit and wraps around trochlea to attach on lat side

21
Q

what does abscence of sympathetic supply to deep smooth muscles of levator palpebra superioris cause

A

drooping of eyelid

22
Q

What muscles are used to look up to the right, straight to the right, down to the right

A

up to right- r- IO, l-SR
side- r- LR, left MR
down to right- r-SO, IR

23
Q

What two muscles in the eye arnt inn by the occulomotor nerve CN3

A

lat rectus- Abducens CN6

sup oblique- Trochlear CN4 (r supplies l mm, vise versa)

24
Q

What is lacrimal fluid stimed by

A

parasympathetic inpulses from CN7

25
Q

what is the most sup muscle in the orbit

A

levator palp sup

26
Q

what are the branches of the opthalmic a and what branch enters the eye

A

Medial, central and lateral

central renial artery enters eye thru optic disk

27
Q

indications of CN3 palsy

A
  1. ipsilateral drooping due to partial iacactivation of lev pal sup
  2. downward, abducted eye due to unopposed action of sup oblique+lat rectus
  3. dialation of ipsilateral pupil
  4. inability to accommodate ipsilateral eye
  5. diplopia
28
Q

indications of CN6 abducens palsy

A

medial deviation due to unopposed action of medial rectus (causes double vision)

29
Q

indication of CN4 trochlear n lesion and when would it get better

A

would cause r eye to be extorted and slightly elevated

-if they tilded their head to the unaffected side

30
Q

where could tumor affect the CN2

A

thru sup orbital fissure

31
Q

why does glacoma occur

A

due to increased intraocular pressur due to blockage of aquages bumor outflow thru scleral venous sinus

An1107- Mod 4 (22 decks)

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