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DHBS 301 > Orbit and the Eye > Flashcards

Orbit and the Eye Flashcards

1
Q

What bones make up the lateral wall of the orbit?

A
  • Sphenoid
  • Zygoma
  • Frontal
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2
Q

What bones make up the medial wall of the orbit?

A
  • Ethmoid
  • Lacrimal
  • Maxilla
  • Frontal
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3
Q

Where is the optic canal located?

A

Lesser wing of the sphenoid bone

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4
Q

What goes through the optic foramen?

A
  • CN II
  • Ophthalmic artery
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5
Q

What goes through the superior orbital fissure?

A
  • CN III
  • CN IV
  • CN V1
  • CN VI
  • Ophthalmic vein
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6
Q

Where is the superior orbital fissure located?

A

Gap in between the greater and lesser wing of the sphenoid

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7
Q

The lacrimal connects…

A

The orbit to the nasal cavity

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8
Q

What opening does the lacrimal have?

A

Opening for nasolacrimal canal

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9
Q

Eyelid/palpebrae function

A
  • Protect and lubricate the eye
  • Stabilize the eye
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10
Q

Conjunctiva is a…

A

Mucous membrane

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11
Q

Conjunctiva location

A

Covers the front surface of the globe of the eye

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12
Q

What nerve mediation to the surface of the eye?

A

CN V1, ophthalmic division

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13
Q

Orbicularis oculi muscle action

A

Muscle of facial expression

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14
Q

Orbicularis oculi muscle innervation

A

CN VII, facial nerve

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15
Q

Orbicularis oculi muscle, orbital portion

A

Closes the eye

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16
Q

Orbicularis oculi muscle, palpebral portion

A

Blinks the eye

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17
Q

Orbicularis oculi muscle, lacrimal portion

A

Promotes drainage of tears into the nasolacrimal duct

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18
Q

Superior and inferior tarsal plates

A
  • Give shape and strength to the eyelid
  • Provides a point of attachment for muscles to attach
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19
Q

Levator palpebrae superioris muscle action

A

Elevates the superior tarsal plate

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20
Q

Palpebral ligaments and the orbital septum provide…

A

Structural support to the tarsal plates and anchor them to the rim of the orbit

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21
Q

Tarsal glands

A

Produces an oily substance that creates a lipid barrier for tear fluid

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22
Q

Lacrimal gland flow

A

Lacrimal gland
Lacrimal puncta
Lacrimal canaliculi
Lacrimal sac
Nasolacrimal duct
Nasal cavity

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23
Q

What is the site of tear production?

A

Lacrimal gland

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24
Q

Lacrimal gland visceral parasympathetic innervation?

A

Facial nerve, CN VII

25
Q

Cornea and lens function

A

Refract incoming light rays, focuses them onto the retina

26
Q

Pupil

A

Light enters the eye here

27
Q

What nerve innervates the pupil?

A

Optic nerve, CN II, conveys impulse to brain

28
Q

Sclera

A

White of the eye, protective

29
Q

Lateral rectus action

A
  • Abduction
  • Lateral rotation
30
Q

Lateral rectus innervation

A

Abducens nerve, CN VI

31
Q

Medial rectus action

A
  • Adduction
  • Medial rotation
32
Q

Medial rectus innervation

A

Oculomotor nerve, CN III

33
Q

Superior rectus action

A
  • Elevate
  • Adduction
34
Q

Superior rectus innervation

A

Oculomotor nerve, CN III

35
Q

Inferior rectus innervation

A

Oculomotor nerve, CN III

36
Q

Inferior rectus action?

A
  • Elevation
  • Adduction
37
Q

Superior oblique action

A
  • Depression
  • Abduction
38
Q

Superior oblique innervation

A

Trochlear nerve, CN IV

39
Q

Inferior oblique innervation

A

Oculomotor nerve, CN III

40
Q

Diplopia

A

Double vision

41
Q

What can damage to the extra ocular muscles or their nerves cause?

A
  • Blurred vision
  • Double vision
42
Q

Where do the superior, inferior, medial, and lateral recti muscles originate?

A

Annulus tendineus

43
Q

Where is the annulus tendinous located?

A

Spans the superior orbital fissure

44
Q

Sensory branches of the trigeminal nerve, ophthalmic division CN V1

A

Supratrochlear nerve
Supraorbital nerve
Lacrimal nerve
Frontal nerve
Long and short ciliary nerves
Nasociliary nerve
Anterior ethmoid nerves
Posterior ethmoid nerves

45
Q

Trigeminal ganglion has…

A

Cell bodies of sensory neurons

46
Q

Where does the ophthalmic artery branch from?

A

Internal carotid artery

47
Q

Where does the ophthalmic artery go through?

A

Optic foramen

48
Q

What veins drain the orbit?

A
  • Superior ophthalmic veins
  • Inferior ophthalmic veins
49
Q

Where do the superior and inferior ophthalmic veins drain into?

A

Cavernous sinus

50
Q

Pupil constriction

A

Parasympathetic

51
Q

Pupil dilation

A

Sympathetic

52
Q

Ciliary body is made of…

A

Smooth muscle

53
Q

Ciliary body function

A

Control the curvature of the lens

54
Q

The ciliary ganglion is a…

A

Parasympathetic ganglion

55
Q

Ciliary ganglion location

A

Behind the eye

56
Q

What caries information to the ciliary ganglion?

A

Short ciliary nerves

57
Q

Parasympathetic fibers to the ciliary gland can come from the….

A

Oculomotor nerve

58
Q

Structures course within the cavernous sinus

A

Internal carotid artery
CN III
CN IV
CN V1
CN V2
CN VI

59
Q

Cavernous sinus thrombosis

A

Clot that obstructs the cavernous sinus vein

DHBS 301 (21 decks)

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