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Anatomy Week 16 > Parker SG (Orbit) > Flashcards

Parker SG (Orbit) Flashcards

1
Q

What bones make up the roof of the orbit?

A
  1. Orbital Plate of Frontal Bone

2. LESSER wing of sphenoid

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2
Q

What bones make up the lateral wall of the orbit?

A
  1. Zygomatic

2. GREATER wing of sphenoid

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3
Q

What bones contribute to the medial wall of the orbit?

A
  1. Frontal
  2. Ethmoid
  3. Lacrimal
  4. BODY of sphenoid
    (pre-study guide adds palatine)
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4
Q

What bone makes up the floor of the orbit?

A
  1. Maxilla

pre-study guide adds palatine

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5
Q

What 5 muscles are innervated by oculomotor n. (CN III)?

A

Upper:

  1. Superior Rectus
  2. Levator Palpebrae Superioris

Lower:

  1. Medial Rectus
  2. Inferior Rectus
  3. Inferior Oblique
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6
Q

What do the 4 rectus mm. originate from?

A
  • Common Tendinous Ring
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7
Q

What 3 mm. aDduct the eye?

A
  • Superior, Inferior, Medial Rectus
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8
Q

What 3 mm. aBduct the eye?

A
  • Superior, Inferior Oblique

- Lateral Rectus

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9
Q

What 2 mm. elevate the eye?

A

Superior Rectus, Inferior Oblique

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10
Q

What 2 mm. depress the eye?

A

Inferior Rectus, Superior Oblique

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11
Q

SO4LR6

A 
Superior Orbital (IV)
Lateral Rectus (VI)
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12
Q

What nerve passing through the supraorbital fissure contains GSA fibers?

A

Opthalmic n. (V1)

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13
Q

What are the 3 branches of opthalmic n. (V1) in the orbit?

A
  1. Frontal n. (V1)
  2. Lacrimal n. (V1)
  3. Nasociliary (V1)
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14
Q

What artery runs with the nasociliary n. (V1)?

A

Opthalmic a.

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15
Q

What neurovascular structures cross the Optic n. (CN II)?

A
  1. Opthalmic a. (traveling with…)

2. Nasociliary n. (V1)

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16
Q

What 5 branches of the nasociliary n.?

A
  1. Anterior Ethmoid n.
  2. Posterior Ethmoid n.
  3. LONG ciliary nn.
  4. Sensory Root to Ciliary Ganglion
  5. Infratrochlear n.
17
Q

What hitchhiker travels with the lacrimal n.?

  • Ganglia
  • Preganglionic
  • Postganglionics
A

Preganglionic:
Greater Petrosal n. (CN VII) –> Nerve of Pterygoid Canal –> PTERGOPALATINE GANGLIA

Postgangionic HITCHHIKERS:
Infraorbital n. —> Zygomatic n. –> Lacrimal n. (via communicating branch)

18
Q

What are the parasympathetic preganglionic to the orbit?

- associated ganglia

A

CN III - Oculomotor
CN VII - (greater pet.)

ganglia:

  • Ciliary
  • PPG
19
Q

What are the parasympathetic preganglionics to the PP Fossa?

- associated ganglia

A

CN VII - (greater pet.)

ganglia:
- PPG

20
Q

What are the parasympathetic pregangionics to the IT Fossa?

- associated ganglia

A

CN VII - (Chorda Tympani)
CN IX - Lesser Pet.

ganglia:

  • PPG
  • Otic
21
Q

What 3 fiber types are received by the ciliary ganglion?

- How do they get there?

A

Sympathetic Root:
Postganglionic Sympathetics - via opthalmic a.

GSA Root:
- Nasociliary n. via its sensory root

Parasympathetic Root:
- Pregalionic GVE fiber from CN III parasympathetic motor root

22
Q

What two structures are linked by the short ciliary fibers?

- fiber type

A
  • Ciliary ganglion to Globe

**???

23
Q

What two structures are linked by the Long Ciliary Fibers?

A
  • Nasociliary n. to Globe

**Direct GSA branches

24
Q

What fiber type dilates the pupil?

A

Sympathetics

25
Q

What fiber type constricts the pupil and accomadates the pupil?

A

Parasympathetics

26
Q

What structures travel through the superior orbital fissure?

A
  1. Oculomotor (CN III)
  2. Trochlear (CN IV)
  3. Opthalmic n. (CN V1)
  4. Abducens n. (CN VI)
  5. Superior and Inferior Opthalmic vv.
27
Q

How does the optic n. (CN II) enter the orbit?

- what comes with it?

A
  • Through the Optic Canal

- Opthalmic a. travels with Optic n.

28
Q

What 4 neurovascular structures enter the optic canal above the tendinous ring?

A
  1. Frontal n. (V1) => Opthalmic (V1)
  2. Lacrimal n. (V1) => Opthalmic (V1)
  3. Troclear n. (IV)
  4. Superior Opthalmic v.
29
Q

What 6 neurovascular structures enter the optic canal INSIDE the tendinous ring?

A
  1. Optic n. (CN II)
  2. Opthalmic a. => INTERNAL carotid
  3. Abducens n. (CN VI)
  4. Upper Division CN III
  5. Lower Division CN III
  6. Nasociliary n. => Opthalmic (CN V1)
30
Q

What 1 thing enters the orbit below the tendinous ring?

A
  1. Inferior Opthalmic a.
31
Q

What is anything tagged in the floor of the sphenoid sinus going to be?

A

N. or A. of the Pterygoid Canal

32
Q

T or F: the opthalmic a. is a branch of the external carotid a.

A

False, it comes from the INTERNAL carotid

33
Q

What vascular structure can cause bulging of the eyes?

A

Infections in the cavernous sinus preventing flow from opthalmic veins putting pressure on the eyes

Anatomy Week 16 (12 decks)

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