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Anatomy > Orbital > Flashcards

Orbital Flashcards

1
Q

What passes thru the inferior orbital fissure?

A

Maxillary nerve and infraorbital vessels

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2
Q

Innervates superior oblique muscle

A

Trochlear nerve CN4

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3
Q

Lacrimal artery

A

Off lateral side of optic nerve, supplies lacrimal gland

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4
Q

What is between the greater wing and the maxilla?

A

Inferior orbital fissure

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5
Q

Depresses the eye, extorts when eye is adducted

A

Inferior rectus. CN3

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6
Q

Abucts/extorts the eyeball

A

Inferior oblique

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7
Q

“white of the eye”

A

sclera

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8
Q

How lens bring near objects into focus

A

Relaxing of the ciliary muscles to make the lens more convex (accommodation)

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9
Q

Only extraocular muscle that originates from anterior part of orbit

A

Inferior oblique

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10
Q

Produces oily secretion that lubricates the edges of the eyelids to prevent them from sticking together

A

Tarsal glands

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11
Q

Innervates medial/inferior rectus, inferior oblique muscles

A

Inferior branch of oculomotor nerve

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12
Q

Parts of the Fibrous layer of the eyeball

A

Sclera and cornea

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13
Q

Anastomose with anterior ciliary arteris

A

Long posterior ciliary arteries

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14
Q

Path of opthalmic artery

A

enters via optic canal, inferiolateral to nerve, crosses superior/mediad once in orbit.

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15
Q

Symp innervation of lacrimal gland

A

From superior cervical gang, vasoconstrictive

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16
Q

Mucous membrane that lines the eyelids/anterior aspects of the eyeballs/lacrimal apparatus

A

Conjunctiva

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17
Q

What is between the greater and lesser wings of the spehnoid?

A

Superior orbital fissure

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18
Q

Carries lacrimal fliud to superior fornix of conjunctiva

A

Excretory ducts

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19
Q

Where does the superior opthalmic vein drain into?

A

Cavernous sinus

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20
Q

Blood supplies for most of orbit

A

Ophthalmic artery via ICA

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21
Q

Fibrous membrane of eyelid

A

Orbital septum. Continuous with periosteum of bony part of the orbital rim and the tarsi

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22
Q

“Pulley” of superior oblique

A

Trochlea

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23
Q

What passes thru the optic canal?

A

Optic nerve and opthalimic artery

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24
Q

Superior oblique action if eye is lateral gaze and abducted eyeball

A

Abducting/intorting

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25
Q

3 layers of the eyeball

A

Fibrous layer, vascular layer, retinal layer

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26
Q

Parasympathetic muscle of the iris that decreases the diameter of the pupil

A

Sphincter pupillae

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27
Q

Communication between orbit and ethmoid for the nerves/vessels

A

Ethmoidal foramina

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28
Q

What protects the corneas/eyeballs

A

eyelids, lacrimal apparatus

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29
Q

Adducts the eye

A

Medial rectus. CN3

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30
Q

What passes thru the superior orbital fissure?

A

CN 3,4,6, V1, opthalmic veins

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31
Q

Attaches lens to ciliary processes

A

Suspensory ligaments

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32
Q

Moves superior eyelid and eyeball (group of muscles)

A

Extrinsic muscles of eye

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33
Q

Thin contractile diaphragm with centure aperature

A

Iris

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34
Q

Parts of the vascular layer

A

Choroid, ciliary body, iris

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35
Q

Infraorbital artery

A

Into orbit via infraorbital foramen. Branch of ICA

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36
Q

Weakest wall of orbit

A

medial wall

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37
Q

Abducts the eye

A

lateral rectus. CN6

38
Q

Separates floor of orbit from lateral wall

A

inferior orbital fissure

39
Q

Origin of recti muscles

A

Common tendinous ring

40
Q

Medial walls of the orbit

A

Orbital plate of ethmoid, frontal process of maxilla, lacrimal, sphenoid bone.

41
Q

Layers of the eyelid

A

Thin skin, skeletal muscle fibers, orbital septum, tarsi, conjunctiva, muscles of superior eyelid

42
Q

Most robust wall of orbit

A

Lateral wall

43
Q

Additional muscles of the upper eyelids

A

Levator palebrae superioris, superior tarsal muscle

44
Q

Parasym innervation of lacrimal gland

A

Via facial nerve/pterygopalatine ganglion

45
Q

Involuntary muscle that closes the eyelids (upper and lower)

A

Orbicularis oculi (palpebral part)

46
Q

Increased ICP causes what to the optic nerve

A

Compression of the subarachnoid space

47
Q

Area between iris and lens

A

Posterior chamber

48
Q

Innervates lateral rectus muscle

A

Abducens CN7

49
Q

Fills anterior/posterior chambers

A

Aqueous humor

50
Q

Transparent part of the fibrous layer of the eyeball

51
Q

Intorsion

A

Rotation of pupil medially towards nose

52
Q

Connects choroid with circumference of iris

A

Ciliary body. Both muscular and vascular

53
Q

Floor of the orbit

A

Orbital process of maxilla primarily. Minor from palatine bone

54
Q

Posterior part of the eyeball where light is focused

A

Ocular fundus

55
Q

Levator palpebrae superioris

A

From posterior part of orbital roof, inserts onto superior tarsus. Innervated by CN3

56
Q

Fills the vitreous body

A

Vitreous humor

57
Q

Lateral wall of orbit

A

Frontal process of zygomatic bone, greater wing of sphenoid bone

58
Q

Occupies 80% of the posterior eyeball

A

Vitreous body

59
Q

Contents of infraorbital canal?

A

infraorbital nerve/vessels

60
Q

Elevates (slightly adducts) and intorts when eye is adducted

A

Superior rectus. CN3

61
Q

How lens brings far objects into focus

A

ciliary muscle contracts to stretch the lens, thinning it

62
Q

Begins from inferior orbital fissure and turns into infraorbital canal?

A

infraorbital groove

63
Q

Sympathetic muscle that increases the diameter of the pupil

A

Dilator pupillae

64
Q

Takes lacrimal fluid to inferior nasal meatus

A

Nasolacrimal duct

65
Q

Lines sclera and is rich in cappillaries

66
Q

Area directly posterior to cornea/anterior to iris

A

Anterior chamber

67
Q

Forms anterior ciliary arteries

A

Muscular brnaches of opthalmic artery

68
Q

Parts of the retinal layer

A

Neural layer, pigmented layer

69
Q

Innervates the superior oblique

70
Q

Extorsion

A

Rotattion of pupil laterally away from nose

71
Q

Supplies outer layer of retina

A

Short posterior ciliary arteries

72
Q

Where lacrimal fuild accumulates in medial corner of the eye

A

Lacrimal canaliculi (drains into lacrimal sac)

73
Q

Roof of orbit

A

Oribital part of frontal bone

74
Q

Parts of the lacrimal gland

A

Orbital part, palpebral part

75
Q

Neural layer contents

A

Optic disk, continuation of optic nerve, macula

76
Q

Oval-shaped area of acute vision

77
Q

Innervates the levator palpabrae superioris/superior rectus

A

Superior branch of oculomotor nerve

78
Q

Branches of ophthalmic artery

A

Lacrimal, central retinal, short posterior ciliary, long posterior ciliary, muscular branches, supraorbital

79
Q

Superior tarsal muscle

A

Smooth muscle fibers running from levator palpebrae superioris to superior tarsus. Innervated by symp postgang of superior cervical ganglion

80
Q

What ganglion does CN3 contribute to?

A

Ciliary ganglion (pregang. Parasymp)

81
Q

Dense connective tissue that makes up the “skeleton” of the eyelid

A

Superior/inferior tarsi

82
Q

Origin of oblique muscles

A

Orbital walls

83
Q

Lacrimal apparatus

A

Production/delivery of lacrimal fliud

84
Q

Adducted eyeball, visual axis is parallel to long axis

85
Q

Innervates the cornea

86
Q

Central retinal artery

A

Pierces connective tissue around optic nerve, supplies optic disk (irreversible blindness is occluded)

87
Q

What contains the apex of the orbit?

A

Lesser wing of the sphenoid (at optic canal)

88
Q

Forms the superior opthalmic vein

A

supraorbital vein and angular vein

89
Q

Anterior thru supraorbital foramen portion of opthalmic artery

A

Supraorbital artery

90
Q

Upper/lower pockets of conjunctiva formed by reflections onto the sclera

91
Q

Shallow depresson in orbital part of the frontal bone

A

Fossa for the lacrimal gland

92
Q

Vascular layer of eyeball venous return

A

Vortical veins

Anatomy (35 decks)

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