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Head and Neck Anatomy > Orbit and Eye > Flashcards

Orbit and Eye Flashcards

1
Q

label the 7 bones that form the orbit

A
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2
Q

what passes through the optic foramen?

A

optic nerve
opthalamic artery

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3
Q

what passes through the superior orbital fissure?

A
  1. oculomotor nerve
  2. trochlear nerve
  3. abducens nerve
  4. opthalamic divisions of cranial nerve V
  5. opthalamic veins
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4
Q

what passes through the inferior orbital fissure?

A

maxillary division of cranial nerve V

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5
Q

what is the type of view that is shown?
what paranasal air sinuses can you see?

A
  1. Water’s view
  2. frontal, maxillary and ethmoid sinus
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6
Q

what are the main contents of the orbit?

A
  1. eyeballs/eyelid
  2. extrinsic ocular muscles
  3. ligaments supporting the eye
  4. cranial nerves (II, III, IV, V, VI)
  5. branches of opthalamic artery
  6. lacrimal apparatus
  7. orbital fat
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7
Q

what are the components of the outer fibrous layer of the eye?

A
  1. sclera
  2. cornea

is a complete layer (extends all the way through)

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8
Q

what are the componentas of the middle vascular layer of the eye?

A
  1. choroid
  2. ciliary body
  3. iris

is incomplete anteriorly > anterior aperturue (in iris) is called pupil

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9
Q

what is the inner sensory layer of the eye composed of?

A
  • retina
  • is present posteriorly but anteriorly it stops short just in fron of the equator of the eye.
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10
Q

what divides the eye into anterior and posterior segments?

A

the crystalline lens

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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 fiven to the gel in the posterior segment of the eye?

A

vitreous humor

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13
Q
A
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14
Q

what part of the eye produces (secretes) aqueous humor?

A

ciliary body

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15
Q

what are the three intrinsic muscles of the eye called?

A
  1. ciliaris
  2. constrictor pupillae
  3. dilator pupillae
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16
Q

what is the location of the ciliaris muscle?

A

scleral spur (within ciliary body)

17
Q

what is the innervation of the intrinsic eye muscles?

A
  • ciliaris and constrictor pupillae > parasympathetic via cranial nerve III.
  • dilator pupillae > sympathetic innervation.
18
Q

when the top of the eye rotates towards the nose, it is called?

A

intortion

19
Q

when the top of the eye rotates away from the nose it is called?

A

extortion

20
Q

what is the elevator muscle of the upper eyelid called?

A

levator palpebrae superioris

21
Q

what innervates the levator palpebrae superioris (LPS) muscle?

A

oculomotor nerve

22
Q

label the extrinsic eye muscles

A
23
Q

label the extrinsic eye muscles

A
24
Q

what is the action of the medial rectus muscle

A

adduction

25
Q

lateral rectus muscle action

A

abduction

26
Q

superior rectus action

A

elevation
adduction
intorsion

27
Q

inferior rectus action

A

depression
adduction
extorsion

28
Q

superior oblique action

A

depression
intorsion (medial rotation)
abduction

29
Q

inferior oblique action

A

elevation
abduction
extorsion

30
Q

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

A

inferior oblique

31
Q

name the ligaments that prevent over-adduction and over-abduction of the eye

A

medial and lateral check ligaments

32
Q

what is the function of the suspensory ligament of the eye?

A

changes the shape of the lens in the process of the accomodation of the eye

33
Q

name the branch of the internal carotid artery that supplies the orbit and eye

A

opthalamic artery

34
Q

which foramen in the orbit do the opthalamic veins pass through to enter into the cavernous sinus in the cranial cavity?

A

superior orbital fissure

35
Q

in which part of the orbit does the lacrimal gland lie?

A

superolateral

36
Q

from which cranial nerve does the parasympathetic innervation to the lacrimal gland arise?

A

greater petrosal nerve (branch of facial nerve)

37
Q

into which meatus of the nasal cavity does the lacrimal sac drain (via the nasolacrimal duct)?

A

inferior meatus

Head and Neck Anatomy (24 decks)

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