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Anatomy Decks > Orbit and eye > Flashcards

Orbit and eye Flashcards

1
Q
A
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2
Q

What are the 3 formaina at the apex of the orbit?

A

The optic foramen, superior orbital fissure and inferior orbital fissure

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3
Q

What passes through the optic formane?

A

Optic nerve

Opthalmic nerve

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4
Q

What passes throguh the superior orbital fissure?

A
  • Cranial Nerve VI (Abducens)*
  • Cranial Nerve IV (Trochlear)*
  • Cranial Nerve III (Oculomotor)*
  • Ophthalmic* division of Cranial Nerve V (V1)
  • Ophthalmic veins*
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5
Q

What passes through the inferior orbital fissure?

A

Inferior Ophthalmic division of Cranial Nerve V (V1)

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6
Q

What is the type of view that is shown?

A

Occipitomental veiw

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7
Q

What paranasal air sinuses can you see in this radiograph.

A
  • Frontal*
  • Maxillary*
  • Ethmoid*
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8
Q

This makes the floor of the orbit weak.

A

Infraorbotal groove

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9
Q

What are the main contents of the orbit?

A
  • Eye*
  • Extrinsic ocular muscles*
  • Ligaments supporting the eye*
  • Optic, Oculomotor, Trochlear & Abducens* nerves
  • Branches of Ophthalmic artery*
  • The lacrimal (tear) apparatus*
  • Orbital fat*
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10
Q

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

A

Cornea and sclera

It is a complete layer

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11
Q

What are the components of the middle vascular layer?

A

Ciliary body

Iris

Choroid

Is incomplete anteriorly. Anterior aperture (in iris) is called pupil

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12
Q

What are the components of the inner sensroy layer?

A

Retina

Is present posteriorly but anteriorly it stops short just in front of equator of the eye

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13
Q

What does the crystalline lens divide into?

A

The eye into an anterior and a posterior segment.

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14
Q

The watery fluid in the anterior segment

A

Aqueous humour

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15
Q

The gel in the posterior segment?

A

Vitreous humour

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16
Q
A
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17
Q

What part of the eye produces (secretes) aqueous humour?

A

Ciliary body

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18
Q

What are the intrinsic muscles of the eye?

A

Ciliaris

Sphincter pupillae

Dilator pupillae

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19
Q

What is the location, action and innervation of the ciliaris?

A
20
Q

What is the location, action and innervation of the sphincter constrictor pupillae?

A
21
Q

What is the location, action and innervation of the dilator pupillae?

A
22
Q

What are eye movement produced by?

A

Extrinsic muscles of the eye

23
Q

Basic ee movements

A
24
Q

What is intort and extort?

A

These movements occur when the head is tilted- In order to keep the eyeballs focused on an object the eyes rotate in the opposite direction.

25
Q

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

A

Intort

26
Q

What are the 6 muscles of the eye?

A

Four of these are straight course and two are oblique

27
Q

the elevator of the upper eyelid is also considered as an extrinsic eye muscle even though it has no action on the eyeball itself. What is this muscle called?

A

Levator palpebrae superioris

28
Q

What innervates the levator palpebrae superioris?

A

Oculomotor nerve

29
Q
A
30
Q
A
31
Q

What are the functions of the medial rectus?

A

Adduction

32
Q

What are the functions of the lateral rectus?

A

Abduction

33
Q

What are the functions of the superior rectus?

A

Elevation

Adduction

Intorsion

34
Q

What is the function of the inferior rectus?

A

Depression

Adduction

Extorsion

35
Q

What is the function of the superior oblique muscles?

A

Depression

Intorion

Abduction

36
Q

What is the function of the inferior oblqiue?

A

Elavtion

Extorsion

Abduction

37
Q

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

A

Inferior oblqiue- Comes from inferior orbital fissure

38
Q

Name the ligaments that prevent over-adduction and over-abduction of the eye.

A

Suspensory Ligament of eyeball – Lockwood’s Ligament

39
Q

What is the function of the suspensory ligament of the eye

A

Support the eye & prevent downward displacement of the eyeball

40
Q

Name the branch of the internal carotid artery that supplies the orbit and the eye.

A

Ophthalmic Artery

41
Q

Which foramina in the orbit do the ophthalmic veins pass through to enter into the cavernous venous sinus in the cranial cavity?

A

Superior Orbital Fissure

42
Q

In which part of the orbit does this structure lie, medial or lateral?

A

Lacrimal Gland is lateral – Lacrimal Sac etc. Medial

43
Q

From which cranial nerve does parasympathetic innervation to this structure arise?

A

Facial nerve

44
Q

Into which meatus of the nasal cavity does it drain (via the nasolacrimal duct)

A

Drains into the inferior nasal meatus

45
Q
A

Anatomy Decks (141 decks)

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