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PNS > CN II Optic > Flashcards

CN II Optic Flashcards

1
Q

The optic vesicle is derived from this, an embryological derivative

A

Prosencephalon

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2
Q

The optic nerve is an extension of what?

A

Brain

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3
Q

Optic nerves are composed of axons from what layer of the retina?

A

Ganglionic layer of retina

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4
Q

Axons of ganglionic neurons of the retina form what?

A

Layer of the optic nerve

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5
Q

What is the outer layer of the eyeball?

A

Fibrous tunic

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6
Q

What are the two components of the fibrous tunic?

A

Sclera and cornea

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7
Q

This occupies the posterior 4/5ths to maintain the shape of the eyeball

A

Sclera

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8
Q

This occupies the anterior 1/5th and is transparent for light pass

A

Cornea

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9
Q

What are the three components of the vascular tunic?

A

Iris
Ciliary Body
Choroidea

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10
Q

What is another term for vascular tunic?

A

Uvea

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11
Q

What is the anterior part of the vascular tunic?

A

Iris

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12
Q

What is the posterior part of the vascular tunic?

A

Choroidea

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13
Q

What is the anterolateral part of the vascular tunic?

A

Ciliary body

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14
Q

In the internal or sensory tunic of the eye (retina), how many layers are present?

A

10

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15
Q

This is also known as Jacob’s membrane?

A

Rods and cones

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16
Q

The retina has this cell type between the internal and external limiting membranes

A

Glial cells of Muller

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17
Q

Transversally connecting cells in the outer plexiform layer

A

Horizontal cells

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18
Q

Cells in the inner plexiform layer

A

Amacrine cells

19
Q

All the optic nerves in the layer of the nerve fibers converge toward this

A

Optic papilla or optic disc

20
Q

The optic disc penetrates the choroid and sclera at this location

A

Lamina cribrosa

21
Q

The optic nerve enters the cranial cavity through this on the sphenoid bone

A

Optic canal

22
Q

What runs with the optic nerve through the optic canal?

A

Ophthalmic artery

23
Q

The right and left optic nerves form this

A

Optic chiasma

24
Q

The optic nerves from what half of both eyes decussate?

A

Nasal half

25
Q

From the chiasma, the optic tracts run around the cerebral peduncles to this

A

Lateral geniculate bodies

26
Q

The optic tract of a single eye is composed of what?

A

Fibers from the lateral half of the eye on the same side and nasal half of the eye on the opposite side

27
Q

What are the three nucleuses of termination?

A

Lateral geniculate body
Pretectal
Superior colliculus

28
Q

Which is the principal nucleus of termination?

A

Lateral geniculate body

29
Q

The lateral geniculate body projects as an optic radiation to which Brodmann area?

A

Brodmann 17

30
Q

Which gyrus is included in Brodmann area 17?

A

Cuneus gyrus

31
Q

This nucleus of termination is for the reflex movement of the sphincter pupillae

A

Pretectal

32
Q

The pretectal nucleus of termination goes through what nucleus and ganglion?

A

Edinger-Westphal nucleus

Ciliary ganglion

33
Q

What nucleus of termination projects for the reflex movement of the head and neck through the ventral column of the cervical cord?

A

Superior colliculus

34
Q

The right an left cortical center of vision are connected through what?

A

Corpus callosum

35
Q

The three tunics that make up the wall of the eyeball is continuous from what?

A

Meninges

36
Q

The outer sheath from the dura blends with what?

A

Sclera

37
Q

The intermediate sheath is continuous from what?

A

Arachnoid mater

38
Q

The intermediate sheath is separated from the outer by what?

A

Subdural space

39
Q

The intermediate sheath is separated from the inner by what?

A

Subarachnoid space

40
Q

The inner sheath is continuous with what?

A

Pia mater

41
Q

The pia mater is vascular and closely invests what nerve?

A

Optic nerve

42
Q

Increased pressure due to excess fluid in the general subarachnoid space from an intracranial neoplasm

A

Papillodema

43
Q

Optic tract lesion only affecting half of the visual field

A

Hemianopia or hemianopsia

44
Q

Peripheral degeneration of visual field

A

Tunnel vision

PNS (23 decks)

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