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Anat 2050 > Orbit > Flashcards

Orbit Flashcards

1
Q
A
  1. Ethmoid
  2. Lacrimal
  3. Frontal
  4. Maxilliary
  5. Zygomatic
  6. Sphenoid
  7. Nasal
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2
Q

Four Angles on the orbit

A
  1. Superior medial: Fossa For lacrimal Gland
  2. Superior Lateral: Fossa For trochlea ligament
  3. Inferior Medial: Inferior Orbital Fissure
  4. Inferior Lateral: Groove for Lacrimal Sac
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3
Q

Nerves and vessels entering the orbit

  • Optic Foramen (3)
  • Superior Orbital Fissure (4)
  • Inferior Orbital Fissure (1)
A
  1. Optic nerve
  2. Ophthalmic Artery
  3. Ophthalmic Vein
  4. Ophthalmic division of trigeminal n
  5. Oculomotor Nerve
  6. Trochlear (Superior Oblique)
  7. Abducens (Lateral Rectus)
  8. Infraorbital Nerve
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4
Q

Common annular Tendon

  1. is
  2. What is attatched (7)
  3. what passes through 4
A

Fibrous ring attached to the sphenoid

The origin of 4 rectus muscles and superior Oblique
Inferior oblique does not: It attaches to the maxilla.

The levator Palpebrae superioris is also attached

  1. Optic nerve
  2. Oculomotor
  3. Abducens
  4. And ophthalmic nerve
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5
Q

The Ophthalmic nerve comprises

3

A
  1. Nasociliary
  2. Lacrimal
  3. Frontal
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6
Q

Eye Movements

6

A
  1. Elevation
  2. Depression
  3. Abduction
  4. Adduction
  5. Intorsion
  6. Extorsion
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7
Q
  • Intorsion and Extorsion is
  • Means
  • is due to the contraction of which muscle?
A

Torsional eye movements are not under voluntary control

Intorsion: top of the eye towards nose: superior oblique

Extorsion: Top of the eye away from nose: inferior obliqe

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8
Q

Gaze

Inferior Rectus

A

Depresses and medially deviates gaze

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9
Q

Gaze

Lateral rectus

A

Laterally deviates gaze

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10
Q

Gaze

Medial rectus

A

Medially deviates Gaze

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11
Q

Gaze

Superior Rectus

A

Elavates and medially deviates gaze

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12
Q

Gaze

Inferior Oblique

A

Elevates and laterally deviates gaze

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13
Q

Gaze

Superior Oblique

A

Depresses and laterally deviates gaze

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14
Q

Depresses and medially deviates gaze

A

Gaze

Inferior Rectus

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15
Q

Laterally deviates gaze

A

Gaze

Lateral rectus

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16
Q

Medially deviates Gaze

A

Gaze

Medial rectus

17
Q

Elavates and medially deviates gaze

A

Gaze

Superior Rectus

18
Q

Elevates and laterally deviates gaze

A

Gaze

Inferior Oblique

19
Q

Depresses and laterally deviates gaze

A

Gaze

Superior Oblique

20
Q

Eyelid content

3

A

Tarsal Glands: lubricate

Levator palpebrae: Raises upper eyelid

Orbicularis Oculi : closes eyelids

21
Q

Eyelid problems

A

Ptosis
Lesion of CN3 and paralysis of levator palpebrae. Or may be lesion of the cervical sympathetic chain as sympathetic nerves also supply levator palpebrae

Occulomotor palsy

Eye cannot adduct and pupil is dilated because the system is not antagonised.

22
Q

A full list of structures entering the Superior Orbital fissure

8

A
  1. Cranial nerves 3, 4, and 6
  2. Lacrimal nerve (Vi)
  3. Frontal Nerve (Vi)
  4. Nasociliary nerve (Vi)
  5. Orbital branch of middle meningeal artery
  6. Recurrent branch of lacrimal artery
  7. Superior orbital vein
  8. Superior Ophthalmic vein
23
Q

A fuller list of structures passing throuh the inferior orbital fissure

6

A
  1. Infraorbital nerve (Vii)
  2. Zygomatic nerve (vii)
  3. Parasympathetics to Lacrimal Gland
  4. Infraorbital Artery
  5. Infraorbital Vein
  6. Inferior Ophthalmic vein branch to pterygoid plexus.
24
Q
  1. Cranial nerves 3, 4, and 6
  2. Lacrimal nerve (Vi)
  3. Frontal Nerve (Vi)
  4. Nasociliary nerve (Vi)
  5. Orbital branch of middle meningeal artery
  6. Recurrent branch of lacrimal artery
  7. Superior orbital vein
  8. Superior Ophthalmic vein
A

A full list of structures entering the Superior Orbital fissure

8

25
Q
  1. Infraorbital nerve (Vii)
  2. Zygomatic nerve (vii)
  3. Parasympathetics to Lacrimal Gland
  4. Infraorbital Artery
  5. Infraorbital Vein
  6. Inferior Ophthalmic vein branch to pterygoid plexus.
A

A fuller list of structures passing throuh the inferior orbital fissure

6

Anat 2050 (17 decks)

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