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OS 204 > Eye And Orbit > Flashcards

Eye And Orbit Flashcards

0
Q

Junction of superior and inferior palpebrae, corners of eye

A

Canthus

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1
Q

Meaty area medial to eye?

A

Lacrimal caruncle

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2
Q

Length of optic nerve

A

1 mm intraocularly

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3
Q

Outermost layer of eye

A

Sclera

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4
Q

Anterior, avascular part of sclera

A

Cornea

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5
Q

Middle vascular layer of eye

A

Uvea

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6
Q

Blood vessels of the eye are located here

A

Choroid

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7
Q

Produces aqueous humor

A

Ciliary body

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8
Q

Controls size of pupil

A

Iris

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9
Q

Innermost layer of eye

A

Retina proper

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10
Q

Located between lens and front of retina and contains gel like substance

A

Vitreous cavity

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11
Q

Aqueous humor from ciliary body goes in this chamber

A

Posterior chamber

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12
Q

What separates the two orbits?

A

Ethmoidal cells and nasal cavity

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13
Q

Distance between medial sides of each eye

A

2.5 cm

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14
Q

Angle between both lateral walls

A

90

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15
Q

Angle between the orbits

A

45

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16
Q

Volume of orbit

A

30 cm3

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17
Q

Volume of globe

A

7 cm3

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18
Q

Length of lateral wall of orbit

A

4-4.5 cm

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19
Q

Length of medial wall of orbit

A

4-4.5 cm

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20
Q

Dimensions of base of triangle of orbit

A

4 cm width, 3.5 cm height

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21
Q

Which part of the globe is more exposed? Lateral or medial

A

Lateral

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22
Q

Lies lateral to the optic nerve and gives the greatest and most acute vision of eye

A

Macula

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23
Q

Superior margin of orbit

A

Frontal bone

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24
Q

Lateral margin of orbit

A

Zygomatic bone and zygomatic process of frontal bone

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25
Q

Inferior margin of orbit

A

Zygomatic bone and maxillary bone

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26
Q

Medial margin of orbit

A

Frontal bone and maxillary bone

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27
Q

Bones in the lateral wall of the orbit

A

Zygomatic bone and greater wing of sphenoid

28
Q

Bones of medial wall of orbit

A

Lesser wing of sphenoid, lateral wall of ethmoid sinus (lamina papyracea), lacrimal bone

29
Q

Bones of the roof of orbit

A

Frontal bone, lesser wing of sphenoid

30
Q

Bones of the floor of the orbit

A

Maxillary bone and palatine bone

31
Q

Bone area drilled in order to access the back of the eye

A

Temporalis fossa

32
Q

Strongest wall of orbit

A

Lateral wall

33
Q

Thinnest wall of orbit

A

Medial wall

34
Q

Anatomic position of the fossa of lacrimal gland

A

Anterosuperolateral

35
Q

Region of orbit with no bony floor

A

Posterior 1/3

36
Q

Shape of the anterior 2/3 of orbit

A

Quadrilateral pyramid

37
Q

Shape of orbit in posterior 1/3

A

Triangular pyramid

38
Q

Floor of this structure is the roof of the orbit?

A

Anterior cranial fossa

39
Q

Roof of this structure is floor of the orbit

A

Maxillary sinus

40
Q

What are the 4 fasciae of the orbit?

A

Fascia bulba, periorbital, palpebral, muscular

41
Q

Also known as the Tenon’s capsule

A

Fascia bulba

42
Q

Origin of all recti muscles and superior oblique

A

Annulus of zinn

43
Q

Muscle not originating from the annulus of zinn

A

Inferior oblique

44
Q

Four parts of optic nerve and corresponding lengths

A

Intraocular 1mm
Intraorbital 30mm
Intracanalicular 5-6mm
Intracranial 10mm

45
Q

Sensory innervation of eye

A

Long ciliary nerve (Cn5)

46
Q

Cranial nerve which splits into 2 branches as it exits the superior orbital fissure

A

Oculomotor

47
Q

Cranial nerve found in the medial part of superior orbital fissure

A

Abducens

48
Q

Cranial nerve which hugs the orbital roof

A

Trochlear

49
Q

Muscles which insert in front of the equator of eye

A

Recti muscles

50
Q

Muscles which insert to the posterior of equator of eye

A

Oblique muscles

51
Q

Extraocular muscle with no tendon

A

Inferior oblique

52
Q

Measurements of this structure are important in correction of eye deviations

A

Spiral of tillaux and insertions of recti muscles

53
Q

Action and innervation of the superior oblique?

A

Medial rotation, depression, abduction. Cn4

54
Q

Action and innervation of inferior oblique

A

Lateral rotation, elevation, abduction. Inferior part of cn3

55
Q

Action and innervation of inferior rectus

A

Depression, lateral rotation, adduction. Inferior part of cn3

56
Q

Action and innervation of superior rectus

A

Elevation, medial rotation, adduction. Superior part of cn3

57
Q

Action and innervation of lateral rectus

A

Abduction, cn6

58
Q

Action and innervation of medial rectus

A

Adduction. Inferior cn3

59
Q

Main blood supply of the eye and orbit

A

Ophthalmic artery

60
Q

Arterial supply of innermost retina

A

Central retinal artery

61
Q

Arterial supply of ciliary body and iris

A

Long posterior ciliary artery

62
Q

Arterial supply of choroid, rods and cones

A

Short posterior ciliary artery

63
Q

Two emergencies in ophthalmology

A

Trauma by acid or alcohol, central retinal artery occlusion

64
Q

Functions for production of tears

A

Lacrimal gland

65
Q

Functions for egress of tears

A

Lacrimal sac

66
Q

Drainage of the lacrimal sac

A

Inferior turbinate through nasolacrimal duct

67
Q

Suction effect of lacrimal sac occurs during _______

A

Blinking

68
Q

Absorbs secretions of lacrimal gland

A

Lacrimal puncta

OS 204 (9 decks)

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