visual pathway Flashcards

1
Q

how many neurons are in the visual pathway?

A

3 - from photoreceptor to cortex

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2
Q

where are the primary and secondary neurons located?

A

in the retina

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3
Q

what are the primary neurons?

A

the bipolar cells

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4
Q

what are the secondary neurons?

A

ganglion cells

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5
Q

how is the optic nerve formed?

A

axons of the ganglion cells run over the retina to optic disk/blind spot and form optic nerve - the optic nerve runs to the lateral geniculate nucleus of thalamus

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6
Q

which nucleus of the thalamus is involved in the visual pathway?

A

the lateral geniculate nucleus

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7
Q

what is the 3 neurone in the neurone chain of the visual pathway?

A

optic radiation - from thalamus to visual cortex

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8
Q

where is the striate cortex?

A

above and below the calcarine sulcus

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9
Q

where does the left half of visual field go to in the brain?

A

the left half the visual field goes to the right hemisphere

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10
Q

where does the right half of visual field go?

A

the right half of the visual field goes to the left hemisphere

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11
Q

which part of the visual field goes to the lower bank of the calcarine sulcus?

A

the upper visual field

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12
Q

which part of the visual field goes to the upper bank of the calcarine sulcus?

A

the lower visual field

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13
Q

where does the centre of visual axis (macula) go?

A

the occipital pole

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14
Q

what is a scotoma?

A

a localised patch of blindness

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15
Q

what is anopia?

A

loss of one or more quadrants of the visual field

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16
Q

which nerve is the afferent (sensory) root in the pupillary light reflex?

A

the optic nerve

17
Q

which nerve is the efferent (motor) root in the pupillary light reflex?

A

oculomotor