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Neuro Science Exam 3 > Visual System > Flashcards

Visual System Flashcards

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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
Q

The right visual field projects to which (L or R) occipital lobe? Explain

A

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
Q

The left visual field projects to which (L or R) occipital lobe? Explain

A

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
Q

Which CNs are responsible for optic reflexes. Describe as afferent or efferent.

A

CN II afferent

CN III efferent

28
Q

Name the reflex. The ability of the eye to make adjustments of the lens to focus on objects at various distances.

A

Accommodation

29
Q

Name the reflex. shine light in eye and get constriction of the pupil in the same eye.

A

Pupillary

30
Q

Name the reflex. shine light in one eye and get constriction of the pupil in the contralateral eye

A

Consensual

31
Q

Which eye reflex involves cortical input? Why?

A

Accommodation

You have to want to look closely.

32
Q

You shine a light in the L eye and both pupils constrict, which reflex(s) are being elicited? Explain

A

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
Q

What mm does CN IV control? Explain the actions

A

superior oblique

If eye adducted, pupil down and in

If eye abducted, rotates eye

34
Q

What mm does CN VI control? explain action

A

Lateral rectus- abduction

35
Q

What mms does CN III control? explain action

A

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
Q

What structures are responsible for coordinating horizontal gaze?

A

MLF and PPRF

37
Q

Describe the path of horizontal gazing.

A

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
Q

Loss of vision from half of the visual field, complete lesion posterior to the optic chiasm

A

Homonymous hemianopia

39
Q

Name the eye lesion.

L eye abducted, depressed, ptosis and dilated pupil.

A

L CN III lesion

40
Q

Name the eye lesion.

L eye adducted and elevated.

A

L CN IV lesion

41
Q

Name the eye lesion.

R eye adducted.

A

R CN VI lesion

42
Q

You shine a light in the R eye, only the R pupil constricts. What reflex is absent?

A

consensual reflex

43
Q

A football player is tackled in the frontal plane, which lobes of the brain will be impacted?

A

parietal/temporal

44
Q

A football player is tackled in the sagittal plane. What lobes of the brain are impacted?

A

frontal/occipital

45
Q

In this eye pathology, there is no awareness of visual information, but the pupillary reflexes remain intact.

A

Cortical blindness

46
Q

Inability to recognize faces

A

Prosopagnosia

47
Q

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

A

visual agnosia

48
Q

Difficulty identifying shapes or differentiating between different objects

A

Apperceptive visual agnosia

49
Q

May not recognize the pictures of an object from different angles and cannot copy a picture of an object

A

Apperceptive visual agnosia

50
Q

Inability to match an object with a memory

A

Associative agnosia

51
Q

Can accurately describe and draw a picture of an object but cant name or state its use.

A

associative agnosia

52
Q

A person can write from dictation, but they cannot read it later. What condition is this?

A

associative agnosia

Neuro Science Exam 3 (5 decks)

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