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Anatomy 2 > Orbit 1 > Flashcards

Orbit 1 Flashcards

1
Q

What 5 things are found in the orbit?

A
  1. Eyeballs
  2. Muscles
  3. Nerves
  4. Fat
  5. Most of the lacrimal apparatus
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2
Q

What bone forms the superior margin of the orbit?

A

Frontal bone

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3
Q

What 2 bones form the lateral margin of the orbit?

A
  1. Zygomatic process of frontal

2. Frontal process of zygomatic

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4
Q

What 2 bones form the medial margin of the orbit?

A
  1. Maxillary process of frontal

2. Frontal process of maxillary

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5
Q

What 2 bones form the inferior margin of the orbit?

A
  1. Zygoma

2. Maxilla

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6
Q

What bone forms the roof of the orbit?

A

Orbital plate of frontal bone

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7
Q

What 2 bones forms the lateral wall of the orbit?

A
  1. Zygoma

2. Greater wing of sphenoid

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8
Q

What bone forms the floor of the orbit?

A

Orbital plate of maxilla

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9
Q

What 4 bones form the medial wall of the orbit?

A
  1. Frontal process of maxilla
  2. Lacrimal bone
  3. Orbital plate of ethmoid
  4. Sphenoid
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10
Q

Name 4 opening into the orbital cavity

A
  1. Supraorbital foramen
  2. Inferior orbital fissure
  3. Superior orbital fissure
  4. Optic canal
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11
Q

What 2 things pass through the supraorbital foramen?

A
  1. Supraorbital nerve

2. Supraorbital blood vessels

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12
Q

What 2 things pass through the inferior orbital fissure?

A
  1. Maxillary nerve

2. Inferior ophthalmic nerve

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13
Q

What 4 nerves pass through the superior orbital fissure?

A
  1. Oculomotor
  2. Trochlear
  3. Abducent
  4. Ophthalmic of trigeminal
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14
Q

What are the 3 branches of ophthalmic of trigeminal?

A
  1. Lacrimal
  2. Frontal
  3. Nasociliary
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15
Q

What vein passes through the superior orbital fissure?

A

Superior ophthalmic vein

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16
Q

What 2 things pass through the optic canal?

A
  1. Optic nerve

2. Ophthalmic artery

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17
Q

What is the conjunctiva?

A

A mucous membrane that lines the eyelid and is reflected at superior and inferior fornices onto anterior surface of eyeballs

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18
Q

What forms the eyelids?

A

A fibrous sheet

19
Q

How are the superior and inferior tarsal plates formed?

A

Orbital septum thickening at its margins

20
Q

What attaches the lateral ends of the plates?

A

Lateral palpebral raphe

21
Q

What attaches the medial ends of the plates?

A

Medial palpebral ligament

22
Q

What is the major muscle within the upper eyelid?

A

Levator palpebrae superioris

23
Q

What is the origin of the levator palpebrae superioris?

A

Apex of orbit

24
Q

What is the 3 insertion points of the levator palpebrae superioris?

A
  1. Skin of the eyelid
  2. Tarsal plate
  3. Conjunctiva of superior fornix
25
Q

What is the action of the levator palpebrae superioris?

A

Raises the upper eyelid

26
Q

What is the nerve supply to the striated part of the levator palpebrae superioris?

A

Oculomotor nerve

27
Q

What is the nerve supply to the smooth part of the levator palpebrae superioris?

A

Sympathetic fibres

28
Q

Describe how the 4 recti muscles originate

A

As a group from a common tendinous ring at the apex of the orbit

29
Q

Name the 4 recti muscles

A
  1. Superior rectus
  2. Medial rectus
  3. Lateral rectus
  4. Inferior rectus
30
Q

Where do the 4 recti muscles insert?

A

Sclera

31
Q

What is the origin of the superior oblique?

A

Junction of the roof and medial wall of the orbit

32
Q

What is the insertion of the superior oblique?

A

Just behind equator of the eyeball

33
Q

What is the origin of the inferior oblique?

A

Nasal side of the orbital wall

34
Q

What is the insertion of the inferior oblique?

A

Lateral surface of the eyeball, deep to lateral rectus

35
Q

What is the action of the medial rectus?

A

Moves eye inwards towards nose

36
Q

What is the action of the lateral rectus?

A

Moves eye outwards away from nose

37
Q

What is the action of the superior rectus?

A

Raises cornea upwards and medially

38
Q

What is the action of the inferior rectus?

A

Depresses cornea downwards and medially

39
Q

What is the action of the superior oblique?

A

Rotate eyeball so cornea looks down and laterally

40
Q

What is the action of the inferior oblique?

A

Rotate eyeball so cornea looks upwards and laterally

41
Q

Name 4 optic muscles innervated by the oculomotor nerve

A
  1. Medial rectus
  2. Inferior rectus
  3. Superior rectus
  4. Inferior oblique
42
Q

Name 1 optic muscle innervated by the abducent nerve

A

Lateral rectus

43
Q

Name 1 optic muscle innervated by the trochlear nerve

A

Superior oblique

44
Q

What is the function of the optic nerve?

A

Sensory for vision

Anatomy 2 (24 decks)

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