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Neuro Science Exam 3 > Visual System > Flashcards

Visual System Flashcards

1
Q

Creation of perception of where a visual object is in relation to us in this area

A

Parietotemporal associational areas

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2
Q

Meaning is given to what we see in this area.

A

Limbic Associational area

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3
Q

How we feel about what we see is determined in this area

A

Limbic Association area

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4
Q

Significance of what we see is determined in this area.

A

Limbic Association area

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5
Q

Goal orientated behavior and how to accomplish it is determined in this area.

A

Prefrontal associational area

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6
Q

Execution of the action is determined in this area.

A

Prefrontal associational area

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7
Q

In what area of the brain does this happen? You see the size and shape of a ball?

A

Primary visual cortex

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8
Q

In what area of the brain does this happen? You see the color and type of the ball.

A

Secondary visual cortex

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9
Q

In what area of the brain does this happen? You recognize that its a basketball.

A

Parietoassociational area

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10
Q

In what area of the brain does this happen? Memories of experiences with basketballs, emotions attached.

A

Occipitotemporal association (includes limbic system)

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11
Q

In what area of the brain does this happen? Decides how you are going to react when the basketball is thrown to you.

A

Prefrontal lobe

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12
Q

In what area of the brain does this happen? You react when the ball is thrown to you.

A

Primary motor cortex.

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13
Q

Describe the conscious visual pathway. State the path.

A

Retina, Optic nerve, Optic chiasm, Optic tract, Lateral geniculate body, visual cortex

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14
Q

The retina contains what type of cells?

A

bipolar

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15
Q

Where is there partial crossing of optic nerves?

A

optic chiasm

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16
Q

Where does the optic nerve run?

A

retina to chiasm

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17
Q

Where does the optic tract run?

A

chiasm to lateral geniculate body

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18
Q

What is the visual relay nucleus in the thalamus?

A

lateral geniculate body

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19
Q

The L visual field is going to project to the ____nasal retina and ____ temporal retina.

A

L nasal & R temporal

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20
Q

The R visual field is going to project to the ___ nasal retina and ___ temporal retina.

A

R nasal & L temporal

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21
Q

The information in the R nasal field came from which visual field? R or L and medial or lateral visual field?

A

R lateral visual field

22
Q

The information on the L temporal field came from which visual field? R or L and medial or lateral visual field?

A

R medial visual field

23
Q

Does the nasal retina cross at the chiasm? Does it project ipsilateral or contralateral?

A

crosses

contralateral

24
Q

Does the temporal retina cross at the chiasm? Does it project ipsilateral or contralateral?

A

does not cross

ipsilateral

25
The right visual field projects to which (L or R) occipital lobe? Explain
L lobe The medial (nasal) visual field comes in on the R eye but crosses at the optic chiasm to the L side. The lateral (temporal) visual field comes in on the L eye but does not cross a the optic chiasm and stays on the L side.
26
The left visual field projects to which (L or R) occipital lobe? Explain
R occipital lobe The medial (nasal) visual field will come in on the L eye, but it crosses at the optic chiasm to the R side. The lateral (temporal) visual field comes in on the R eye and it does not cross at this chiasm.
27
Which CNs are responsible for optic reflexes. Describe as afferent or efferent.
CN II afferent CN III efferent
28
Name the reflex. The ability of the eye to make adjustments of the lens to focus on objects at various distances.
Accommodation
29
Name the reflex. shine light in eye and get constriction of the pupil in the same eye.
Pupillary
30
Name the reflex. shine light in one eye and get constriction of the pupil in the contralateral eye
Consensual
31
Which eye reflex involves cortical input? Why?
Accommodation You have to want to look closely.
32
You shine a light in the L eye and both pupils constrict, which reflex(s) are being elicited? Explain
Pupillary and consensual Pupillary because the eye that the light is shining in constricts Consensual because the R eye constricts even though the light was shined in the L eye
33
What mm does CN IV control? Explain the actions
superior oblique If eye adducted, pupil down and in If eye abducted, rotates eye
34
What mm does CN VI control? explain action
Lateral rectus- abduction
35
What mms does CN III control? explain action
Levator palpabrae- lifts eyelid superior rectus- elevates eye medial rectus- adducts eye inferior rectus- depresses eye inferior oblique- if eye adducted, pupil elevates; if eye abducted rotates eye
36
What structures are responsible for coordinating horizontal gaze?
MLF and PPRF
37
Describe the path of horizontal gazing.
Example of R eye looking R 1. Visual cortex stimulates the paramedian pontine reticular formation (PPRF) 2. R CN VI nucleus stimulates Lat rectus of R eye and sends signal across midline to 3. MLF which stimulates 4. L CN III nucleus to stimulate medial rectus of L eye
38
Loss of vision from half of the visual field, complete lesion posterior to the optic chiasm
Homonymous hemianopia
39
Name the eye lesion. L eye abducted, depressed, ptosis and dilated pupil.
L CN III lesion
40
Name the eye lesion. L eye adducted and elevated.
L CN IV lesion
41
Name the eye lesion. R eye adducted.
R CN VI lesion
42
You shine a light in the R eye, only the R pupil constricts. What reflex is absent?
consensual reflex
43
A football player is tackled in the frontal plane, which lobes of the brain will be impacted?
parietal/temporal
44
A football player is tackled in the sagittal plane. What lobes of the brain are impacted?
frontal/occipital
45
In this eye pathology, there is no awareness of visual information, but the pupillary reflexes remain intact.
Cortical blindness
46
Inability to recognize faces
Prosopagnosia
47
loss of ability to recognize and identify familiar objects and/or people by sight without the loss of ability to actually see the object or person
visual agnosia
48
Difficulty identifying shapes or differentiating between different objects
Apperceptive visual agnosia
49
May not recognize the pictures of an object from different angles and cannot copy a picture of an object
Apperceptive visual agnosia
50
Inability to match an object with a memory
Associative agnosia
51
Can accurately describe and draw a picture of an object but cant name or state its use.
associative agnosia
52
A person can write from dictation, but they cannot read it later. What condition is this?
associative agnosia

Neuro Science Exam 3 (5 decks)

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