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Head & Neck - Anatomy (Year 2) > W3: S1+2 - Orbit and Eye > Flashcards

W3: S1+2 - Orbit and Eye Flashcards

1
Q
A
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2
Q
A
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3
Q

What structures pass through the optic foramen (optic canal)?

A
  • Optic nerve
  • Opthalmic artery
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4
Q

What 5 structures pass through the superior orbital fissure?

A
  • Abducens nerve
  • Occulomotor nerve
  • Trochlear nerve
  • Opthalmic division of trigeminal nerve
  • Opthalmic veins
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5
Q

What nerve passes through the inferior orbital fissure?

A

Maxillary division of trigeminal

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6
Q

What are the main contents of the orbit?

A
  • Eyeball
  • Extrinsic ocular muscles
  • Ligaments supporting the eye
  • Optic nerve
  • Branches of opthalmic artery
  • Lacrimal apparatus
  • Opthalmic veins
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7
Q

What are the three component parts of the eyeball?

A

Outer fibrous layer

Middle vascular layer

Inner sensory layer

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8
Q

What structures make up the outer fibrous layer and is it a complete layer?

A
  • Cornea
  • Sclera

It is a complete layer

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9
Q

What structures make up the middle vascular layer of the eye and is it a complete layer?

A
  • Ciliary body
  • Iris
  • Choroid

Incomplete layer anteriorly as the pupil

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10
Q

What structures make up the inner sensory layer and is it a complete layer?

A
  • Retina

Only present posteriorly

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11
Q

What is the name given to the watery fluid in the anterior segment of the eye?

A

Aqueous humor

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12
Q

What is the name given to the gel like fluid in the posterior part of the eye?

A

Vitreous humor

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13
Q
A
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14
Q

What secretes aqueous humor and where?

A

Ciliary body

In the posterior chamber

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15
Q

What are the three intrinsic muscles of the eye?

A

Ciliaris

Sphincter pupillae

Dilator pupillae

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16
Q

Where is the ciliaris muscle located?

A

The vascular layer surrounding the iris

17
Q

What is the action of the ciliaris?

A

Used in accomodation

18
Q

What is the innervation of the ciliaris?

A

Parasympathetic

  • Occulomotor
19
Q

Where is the sphincter pupillae located?

A

Pupillary border of the iris

20
Q

What is the action of the sphincter pupillae?

A

Narrowing the pupil

21
Q

What is the innervation of the sphincter pupillae?

A

Parasympathetic

  • Occulomotor nerve
22
Q

Where is the dilator pupillae located?

A

Outer to inner border of the iris

23
Q

What is the action of the dilator pupillae?

A

Widens the pupil

24
Q

What is the innervation of the dilator pupillae?

A

Sympathetic innervation

25
Q

What eye movement is looking up?

A

Elevation

26
Q

What eye movement is looking medially?

A

Adduction

27
Q

What eye movement is looking down?

A

Depression

28
Q

What eye movement is looking towards the temples?

A

Abduction

29
Q

What is the name given to the eye movement that keeps the eye on a level plane when the head is tilted?

A

Intorsion and extorsion

30
Q

What are the 6 extrinsic muscles of the eye?

A

4 Recti

  • Lateral
  • Medial
  • Superior
  • Inferior

2 Obliques

  • Superior
  • Inferior
31
Q

Identify

A

A: Medial rectus

B: Superior rectus

C: Superior oblique

D: Inferior oblique

E: Inferior rectus

F: Lateral rectus

32
Q

What other muscle is also considered an extrinsic eye muscle even though it has no effect on the eyeball itself?

A

Levator palpebrae superioris

33
Q

What muscles are supplied by occulomotor nerve?

A

Recti

  • Superior rectus
  • Medial rectus
  • Inferior rectus

Oblique

  • Inferior oblique

Other

  • Levator palpebrae superioris
34
Q

What muscle is supplied by the trochlear nerve?

A

Superior oblique

  • Remember this by the fact that the superior oblique is attached to a trochlea to allow it to turn the eye
35
Q

What muscles are innervated by abducens nerve?

A
  • Lateral rectus
36
Q

What is the only muscle that does not arise from the posterior aspect of the orbit?

A

Inferior oblique

37
Q

What ligaments prevent overadduction and overabduction of the eye?

A

Medial and lateral check ligaments

38
Q

What is the function of the extrinsic suspensory ligament?

A

Resist the posterior pull of the recti

39
Q

What branch of the ICA supplies the orbit and the eye, shown below

A

Opthalmic artery

Head & Neck - Anatomy (Year 2) (19 decks)

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