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Anatomy 205 > Nerves Of Orbit: Sensory Nerve > Flashcards

Nerves Of Orbit: Sensory Nerve Flashcards

1
Q

Sensory nerves (2)

A
  1. Ophthalmic division of Trigeminal nerve
  2. Optic nerve 2nd cranial nerve
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2
Q

Ophthalmic division of Trigeminal nerve branches (3)

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

Nasociliary nerve branches (4)

A
  1. Two long ciliary nerves
  2. Anterior ethmoidal nerve
  3. Posterior ethmoidal nerve
  4. Infratrochlear nerve
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4
Q

Ophthalmic division of Trigeminal nerve course

A

Divides into 3 branches before entering orbit through superior orbital fissure

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5
Q

Nasociliary nerve course

A
  1. Carries ciliary ganglion
  2. Enters orbit through medial part of SOF
  3. Pass medial
  4. Cross optic nerve
  5. Reach orbit medial wall
  6. Passes forwards giving its branches
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6
Q

Two long ciliary nerves course

A
  1. Run along optic nerve
  2. Pierce eyeball back
  3. Carry sympathetic fibers to dilator pupillae muscle
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7
Q

Long ciliary nerves supply

A

Dilator pupillae muscle by sympathetic fibers

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8
Q

Anterior ethmoidal nerve course

A
  1. Passes via anterior ethmoidal foramen
  2. Enter anterior cranial fossa
  3. Passes to nasal cavity
  4. Leaves as external nasal nerve
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9
Q

Anterior ethmoidal nerve supply

A

Nasal cavity

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10
Q

Posterior ethmoidal nerve course

A

Pass through posterior ethmoidal foramen

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11
Q

Posterior ethmoidal nerve supply

A

Ethmoidal air cells

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12
Q

Infratrochlear nerve course

A

Pass below torchea to eye medial angle

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13
Q

Infratrochlear nerve supply (2)

A
  1. Medial parts of eyelids
  2. Nose root
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14
Q

Frontal nerve course

A

Largest branch
1. Enters orbit through middle of SOF
2. Passes forwards below orbital roof and above Levator palpebrae muscle
3. Divides into 2 terminal branches

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15
Q

Frontal nerve branches (2)

A
  1. Supraorbital nerve
  2. Supratrochlear nerve
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16
Q

Frontal nerve supply

A
  1. Skin of upper eyelid
  2. Scalp anterior part
17
Q

Lacrimal nerve course

A

Smallest branch
1. Enters orbit through lateral end SOF
2. End in lacrimal gland
3. Receives twig from zygomaticotemporal branch of maxillary nerve containing secretomotor fibers to lacrimal gland

18
Q

Lacrimal nerve branch

A
  1. Palpebral nerve
19
Q

Lacrimal nerve supply

A

Upper lid lateral 1/3

20
Q

Optic nerve

A

Axons of retinal ganglionic cells

21
Q

How does optic nerve differ from other cranial nerves

A

It is surrounded by extension of meninges which means it’s surrounded by subarachnoid space and CSF

22
Q

What causes optic disc edema (papilloedema)

A

Increase in intracranial pressure of optic nerve

23
Q

Optic nerve course

A
  1. Leaves orbit
  2. Enters cranial cavity through optic foramen
  3. It partially decussates with nerve on the opposite side
  4. Form optic chiasma

Anatomy 205 (197 decks)

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