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oral cavity - BDS 1 > the orbit :) > Flashcards

the orbit :) Flashcards

1
Q

function of the orbit

A

support and protect the eye and associated structures

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2
Q

bones of the orbit

A 
frotal
ethmoid
lacrimal
maxilla
zygomatic
sphenoid 
palatine
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3
Q

what makes up the roof of the orbit

A

frontal bone

lesser wing of sphenoid

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4
Q

floor of orbit

A

maxilla
zygomatic
greater wing of sphenoid

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5
Q

lateral wall of orbit

A

zygomatic

greater wing of sphenoid

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6
Q

medial wall of orbit

A

maxilla
lacrimal
ethmoid
body of sphenoid

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7
Q

what goes through the optic canal

A

optic and ophthalmic nerve

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8
Q

where is the optic canal found

A

lesser wing of sphenoid

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9
Q

what runs through the inferior orbital fissure

A

zygomatic branch of V2

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10
Q

where is the superior orbital fissure

A

between greater and lesser wing of sphenoid

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11
Q

layers of the globe

A

schlera
choroid
retina

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12
Q

sclera

A

white tough fibrous coat of eye
avascular
collagen type I and III

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13
Q

choroid

A

vascular

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14
Q

cornea

A

barrier
protects inner structure of the eye
transparent outer layer

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15
Q

iris

A

controls light entering the eye

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16
Q

lens

A

refract light as it passes into the eye

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17
Q

vitreous

A

helps maintain round shape

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18
Q

what is the eyelid raised bu

A

levator palpebrae superioris

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19
Q

what results in ptosis (drooping of eyelid)

A

loss of innervation of CN III ocularmotor

20
Q

chemical thing for innervation of musucles of eye

A

3(LR6SO4)
abducens
trochlear
oculomotor

21
Q

what does the superior rectus do

A

up or

midline

22
Q

medial retcus

A

midline

23
Q

superior oblique

A

down and out

24
Q

inferior oblique

A

up and out

25
Q

inferior rectus

A

down or

midline

26
Q

lateral rectus

A

lateral

27
Q

where do nerves pass through reach the orbit and where is ti

A

cavernous sinus

above and lateral to sphenoid air sinuses

28
Q

what is cavernous sinus enclosed in

A

dura mater

29
Q

how do the venous sinuses communicate with superficial sructures

A

through emissary sinuses

30
Q

what is infection of cavernous isnus

A

cavernous sinus thrombosis
results in decrease or loss of vision
chemises
paralysis of cranial nerves which course through sinus

31
Q

what can a tumour in the cavernous sinus lead to

A

mechanical compression of nerves

32
Q

soft tissue injury

A

oedema and haemorrhage

33
Q

bone injuries

A

fractures of lateral wall orbital roof and optic foramen

34
Q

impure blow out

A

object much larger than the dimeter of the orbital rim

- orbital rim is fracture and floor is blown out

35
Q

pure blow out

A

object same lie or lightly bigger than orbital rim

- rim intact, medial wall or floor blows out

36
Q

what can cause rupture of the globe

A

objects smaller than the diameter of orbital rim

37
Q

peri orbital ecchymosis

A

black eye

swelling of lids

38
Q

subjective haemorrhage

A

eyeball red

39
Q

loss of vision

A

injury to optic nerve or cilia body

40
Q

traumatic mydraiasis

A

dilated pupil

41
Q

numbness over distribution of infraorbital nerve

A

altered sensation

tingling over cheeck

42
Q

what are facial fractures called

A

le fort fracures

43
Q

1st degree le fort fracture

A

horizontal through maxilla

44
Q

2nd degree le fort fracture

A

fracture through maxilla, nasal bone and inferior medial wall of orbit
pyramidal

45
Q

3rd degree le fort fracture

A

zygomatic, lateral and medial wall of nasal bone
posterior and lateral orbit wall (facial skeleton detached from cranium)
i.e. horzizonal through eyes

oral cavity - BDS 1 (66 decks)

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