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Term 3: Head and Neck > Orbit > Flashcards

Orbit Flashcards

1
Q

What is the most superficial muscle of the orbit? What is its nerve supply?

A
  • Orbicularis Oculi

- CN VII

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2
Q

What are the two portions of the Orbicularis Oculi?

A
  • palbebral portion (inner)

- Outer orbital portion (outer)

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3
Q

What are the layers of the eyelid starting with the skin?

A
  • skin
  • orbicularis oculi (palpebral)
  • Tarsal plate
  • Glands
  • Palpebral Conjunctiva
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4
Q

What is Ptosis?

A
  • drooping of the eyelid
  • from loss of sympathetic innervation to the eyelid

Complete closure of the eye = damage to somatic fibers

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5
Q

What is mydriasis?

A

-dilation of the pupil

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6
Q

What nerve innervates the superior oblique?

A

Trochlear nerve

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7
Q

What nerve innervates the lateral rectus?

A

Abducens

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8
Q

What nerve innervates all of the eye muscles except for the superior oblique and lateral rectus?

A

-Occulomotor

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9
Q

Which cranial nerves contain parasympathetics?

A

3, 7, 9, 10

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10
Q

What is the function of the lacrimal branch of V1?

A

sensory to the lateral orbit

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11
Q

Which artery supplies the retina?

A
  • central artery of the retina (inner 2/3)

- choroidal vaculature (outer 1/3)

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12
Q

What movement does orbicularis oculi perform?

A

-light blinking closure of the eye

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13
Q

What happens to the eyelid on the side of a facial nerve lesion?

A

-can’t close eye

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14
Q

What does the levator palpebrae superioris attach to in the eye lid?

A

-the superior tarsal plate

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15
Q

What is the innervation to levator palpebrae supeiroris?

A
  • CN III (striated muscle)

- sympathetics from superior cervical ganglion (smooth muscle)

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16
Q

What are the symptoms of a lesion to CN III?

A
  • completely closed eyelid
  • mydriasis
  • lateral rotation of the globe
17
Q

Where is the lacrimal gland located in relation to the eye?

A

-superior and lateral of the globe

18
Q

What fibers are contained within the short ciliary nerve?

A
  • general sensory fibers from V1
  • postsynaptic parasympathetic from ciliary ganglion (CNIII) = pupil constriction & accomodation
  • postsynaptic sympathetic fibers from carotid plexus
19
Q

What fibers are contained within the long ciliary nerve?

A
  • General sensory from V1

- postsynaptic fibers from superior cervical ganglion via carotid plexus

20
Q

What’s the first thing to think about when glen mentions the short ciliary nerve?

A

-parasympathetics from ciliary ganglion that control pupil constriction & accomodation

21
Q

On which sides of the optic nerve do the long and short ciliary nerves run?

A

Long = medial side

Short = lateral side

Term 3: Head and Neck (12 decks)

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