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Nervous System > Visual system > Flashcards

Visual system Flashcards

1
Q

What are the fields of each eye?

A

Temporal field

Nasal field

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2
Q

What are the parts of the retina in each eye?

A

Temporal retina

Nasal retina

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3
Q

How does light enter the eye?

A

Diagonally - crosses from temporal field onto nasal retie or vice versa

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4
Q

What are the parts of the visual system?

A 
Eye
Optic nerve
Chiasm 
Optic tract
Lateral geniculate nucleus 
Radiation (inferior or superior)
Primary visual cortex
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5
Q

Where are the inferior radiations found in the brain?

A

Temporal lobe

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6
Q

Where are the superior radiations found in the brain?

A

Parietal lobe

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7
Q

How is vision into the eye divided?

A

Into quadrates

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8
Q

Where do neurones on the temporal retina synapse?

A

Ipsilateral LGN

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9
Q

Where do neurones on the nasal retina synapse?

A

Contralateral LGN

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10
Q

Describe the path of a neurone from the superior temporal quadrant

A

Passes into optic nerve
At the chiasm - stays on ipsilateral side
Passes through the optic tract
Synapses in the ipsilateral LGN
Travels in the superior radiation to the primary visual cortex

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11
Q

Describe the path of a neurone from the inferior temporal quadrant

A

Passes into optic nerve
At the chiasm - stays on ipsilateral side
Passes through the optic tract
Synapses in the ipsilateral LGN
Travels in the inferior radiation to the primary visual cortex

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12
Q

Describe the path of a neurone from the superior nasal quadrant

A

Passes into optic nerve
At the chiasm - crosses into contralateral side
Passes through the optic tract
Synapses in the contralateral LGN
Travels in the superior radiation to the primary visual cortex

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13
Q

Describe the path of a neurone from the inferior nasal quadrant

A

Passes into optic nerve
At the chiasm - crosses into contralateral side
Passes through the optic tract
Synapses in the contralateral LGN
Travels in the inferior radiation to the primary visual cortex

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14
Q

What is the visual field defect with a lesion in the optic nerve?

A

Monocular visual loss of ipsilateral side

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15
Q

What is the visual field defect with a lesion in the optic chiasm?

A

Bitemporal hemianopia - loss of temporal field on both sides

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16
Q

What is the visual field defect with a lesion in the optic tract?

A

Contralateral homonymous hemianopia - loss of vision on opposite side

17
Q

What is the visual field defect with a lesion in the superior radiation?

A

Contralateral superior quadrantopia

18
Q

What is the visual field defect with a lesion in the inferior radiation?

A

Contralateral inferior quadrantopia

19
Q

What is the visual field defect with a lesion in both radiations?

A

Contralateral homonymous hemianopia

Nervous System (17 decks)

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