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CNS > eye muscles > Flashcards

eye muscles Flashcards

1
Q

role of the intrinsic muscles of the eye

A

to contol the diameter of the pupil

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2
Q

role of extrinic muscles of the eye

A

move the eyeball

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3
Q

what are the 4 straignt musle of the yee

A

medial recuts
lateral rectus
superior rectus
inferioro rectus

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4
Q

where do the recti muscles arrise from

A

apex of the orbit form an annular fibrous ring

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5
Q

where do the superior oblique muscles arrise from

A

rootf othe of the orbit positerly
spphenoid bone

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6
Q

where do eshte inferio oblique msulce arrise from

A

floor of the orbit antieroy

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7
Q

what is a trochlea

A

pulley (anatomy terms)

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8
Q

which mucles has a trochlea

A

superior oblique

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9
Q

what bone is behind te annular fibrous

A

splenoid bone

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10
Q

role of levator p;alpebrae superioris

A

elevate the eyelid

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11
Q

whihc part of hte sclear does hte so and io jion

A

posteior

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12
Q

which part of the sclear does hte recti join

A

the anterior part of the sclera

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13
Q

what nerve inervates the so

A

trochlear nerve

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14
Q

what nerve innervates the lr

A

abducent

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15
Q

what nerve innervates everthing apart from so and lr

A

occulomotor

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16
Q

what is the movement of eyes up and down called

A

levating and depressing

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17
Q

what is the movement of the eyes towards and away from the nose called

A

adduction - to wards nose
abduction - away from nose

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18
Q

what is intorsion and extorision

A

intorsion - top of eye towards nose
extorsion - top of eye away from nose

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19
Q

what is the main action of the the 1 - mr
2 - lr

A

mr - adduction
lr - abduction

20
Q

what is the actions of te sr

A

elevation
adduction
intorsion

21
Q

why does the sr adduct

A

due to its 23 degree orientation

22
Q

actionons of the ir

A

depression, adduction, extrusion

23
Q

what is special about the ir

A

it adducts and extorsion , due to its orintation

24
Q

what is the movemtns of the so

A

intorsion, depression, abduction

25
Q

why does the superior oblique cause depression

A

due to its place in the eye is very postioery, thus pulling it forwards and down

26
Q

what is the ovemtn of the xo

A

extorison, elvation , abdution

27
Q

radsin

A

recti ADductors
Superiors Intortors

28
Q

move ments of eyes to the right name

A

dextorverion

29
Q

movement of eyes to left naem

A

levoversion

30
Q

what is the movemtn of the eye to the right and up

A

detroverion elvation

31
Q

what is strabismus

A

squiting

32
Q

what is esotropia

A

wher the squint is becoesn one eye moves too meidal

33
Q

what is exotropia squint

A

because one eye moves to lateral

34
Q

amblypopia

A

lazy eye

35
Q

what is the cuase of amblyopia

A

brain suppreses image of one eye leading to poor vision in that eye with out any patholoyg

36
Q

what is diplopia

A

double vison

37
Q

cuases of double visoin

A

nerve palsies , leading to squint, the focal point on eye moves suddely

38
Q

what are the 3 intrinsic eye msuels

A

cilararis muscle
constricor pupillae
dilatora pupillae

39
Q

what intrinsic eye muslces are innervted by parasympathiec and by what nerve

A

cillaris musles
consticor pupillae
by 3rd craial nerve

40
Q

what is the inervation of the dilator pupilae

A

sympatheic,

41
Q

where does the ysmpahtic innervationfor the dilator pupilae follow

A

around intenral carroid artyer

42
Q

where is the cilaris muslce found

A

cilary body

43
Q

where is the constior pupillae found

A

iris at pupillary border

44
Q

where is the dilator pupillae found

A

radillar around the iris

45
Q

is sympatheic or parasympatheic triggered by increased lumination

A

parasympatheic

46
Q

is sympatheic or parasympdic triggere dby decread illumation

A

sympatheic

47
Q
A

CNS (36 decks)

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