Lecture 20: Visual Tracts Flashcards

1
Q

An image focused on the retina will be centered at what structures?

A

Fovea centralis

Macula lutea

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2
Q

What structure is found at the blind spot of the retina?

A

Optic disc: located medial to the macula

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3
Q

What structure does the optic tract terminate in?

A

Lateral Geniculate Nucleus

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4
Q

What fibers of the optic radiations are received by the superior bank of the calcarine sulcus?

What lobe?

A

Fibers from lower quadrant of contralateral hemifields

Cuneus

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5
Q

What fibers from the optic radiations target the inferior bank of the calcarine sulcus?

What part of the occipital lobe?

A

Fibers from upper quadrant of contralateral hemifields

Lingual gyrus

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6
Q

What fibers form the Meyer loop?

A

Fibers from upper quadrant of contralateral hemifields

Pass into temporal lobe to form u-turn

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7
Q

Fibers conveying information from the ____ and ___ originate from central regions of the LGN and pass to caudal portions of the visual cortex.

A

Macula

Fovea

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8
Q

What visual field deficit can be produced if there is a lesion to the temporal lobe?

What visual structure has been damaged?

A

Superior visual field deficit: damage to Meyer’s loop

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9
Q

Where does the retinal input to the superior colliculus come from?

A

Select fibers from optic tract that bypass the LGN

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10
Q

What is the function of the superior colliculus?

A

Spatailly directs head movements and visual reflexes

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11
Q

What is a heteronymous visual field lesion?

A

Two eyes have non-overlapping field losses

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12
Q

What kinds of visual field deficits are produced when there is damage anterior to the optic chiasm?

A

Deficit only in ipsilateral eye

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13
Q

What kind of visual field deficits are produced when there is damage at the optic chiasm?

A

Heteronymous deficits

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14
Q

Damage behind the optic chiasm causes what kind of visual field deficits?

A

Homonymous deficits

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15
Q

The closer a lesion is to ___, the more congruous it is likely to be.

A

Visual cortex

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16
Q

What is the disorder? Where is the lesion?

A

Central Scotoma

Lesion in Right Temporal retina

17
Q

What is the disorder? Where is the lesion?

A

Bitemporal Hemianopsia

Optic Chiasm lesion

18
Q

What is the disorder? Where is the lesion?

A

Total loss of vision in R eye

R Optic nerve lesion

19
Q

What is the disorder? Where is the lesion?

A

Contralateral (left) homonomous hemianopia

Lesion in Optic Tract or Geniculocalcarine tract

20
Q

What is the disorder? Where is the lesion?

A

Left Superior Homonomous Quadrantanopia

Temporal Lobe (Meyer’s Loop)

21
Q

What is the disorder? Where is the lesion?

A

Left Inferior Homonymous Qudrantanopia

Parietal Lobe

22
Q

What is the disorder? Where is the lesion?

A

Superior Left Homonymous Quadrantanopia with macular sparing

Inferior bank of calcarine fissure

23
Q

What is the disorder? Where is the lesion?

A

Inferior left Homonymous Quadrantanopia with macular sparing

Superior bank of calcarine fissure

24
Q

What is the disorder? Where is the lesion?

A

Contralateral (left) homonymous hemanopia) with macular sparing

Both banks of calcarine fissure