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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
What is the action of the levator palpebrae superioris?
Raises the upper eyelid
26
What is the nerve supply to the striated part of the levator palpebrae superioris?
Oculomotor nerve
27
What is the nerve supply to the smooth part of the levator palpebrae superioris?
Sympathetic fibres
28
Describe how the 4 recti muscles originate
As a group from a common tendinous ring at the apex of the orbit
29
Name the 4 recti muscles
1. Superior rectus 2. Medial rectus 3. Lateral rectus 4. Inferior rectus
30
Where do the 4 recti muscles insert?
Sclera
31
What is the origin of the superior oblique?
Junction of the roof and medial wall of the orbit
32
What is the insertion of the superior oblique?
Just behind equator of the eyeball
33
What is the origin of the inferior oblique?
Nasal side of the orbital wall
34
What is the insertion of the inferior oblique?
Lateral surface of the eyeball, deep to lateral rectus
35
What is the action of the medial rectus?
Moves eye inwards towards nose
36
What is the action of the lateral rectus?
Moves eye outwards away from nose
37
What is the action of the superior rectus?
Raises cornea upwards and medially
38
What is the action of the inferior rectus?
Depresses cornea downwards and medially
39
What is the action of the superior oblique?
Rotate eyeball so cornea looks down and laterally
40
What is the action of the inferior oblique?
Rotate eyeball so cornea looks upwards and laterally
41
Name 4 optic muscles innervated by the oculomotor nerve
1. Medial rectus 2. Inferior rectus 3. Superior rectus 4. Inferior oblique
42
Name 1 optic muscle innervated by the abducent nerve
Lateral rectus
43
Name 1 optic muscle innervated by the trochlear nerve
Superior oblique
44
What is the function of the optic nerve?
Sensory for vision

Anatomy 2 (24 decks)

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