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Ophthalmology > Optic Tract Anatomy > Flashcards

Optic Tract Anatomy Flashcards

1
Q

Where is the visual cortex located?

A

The most posterior part of the occipital lobe

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2
Q

What fissure does the visual cortex lie beside?

A

The calcarine fissure

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3
Q

Which lobe does Meyer’s loop pass through?

A

Temporal

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4
Q

Which part of the optic tract passes through the parietal lobe?

A

Upper optic Radiation

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5
Q

What visual field so the Upper optic radiation correspond with?

A

Inferior visual field

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6
Q

What retinal fibers are carried in the Upper Optic Radiation?

A

Superior Retinal Quadrants

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7
Q

What retinal fibers are carried in the Lower Optic Radiation

A

Inferior retinal Quadrants

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8
Q

What visual field does the lower optic radiation correspond with?

A

Superior Visual fields

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9
Q

What does Meyer’s loop pass around?

A

The lateral ventricle

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10
Q

Which optic radiation is Meyer’s loop part of?

A

Lower optic radiation

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11
Q

Where do the optic radiations come from?

A

Lateral Geniculate Nucleus

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12
Q

Where is the lateral geniculate nucleus?

A

Dorsal thalamus

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13
Q

What fibers are contained in the Left optic tract?

A

Left temporal retina

Right nasal retina

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14
Q

What fibers are contained in the Right Optic Tract?

A

Right temporal retina

Left Nasal retina

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15
Q

Where is the right visual field processed?

A

Left visual cortex

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16
Q

Where is the left visual field processed?

A

Right visual cortex

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17
Q

Where do the nasal fibers of the optic tract cross over?

A

The optic chiasm

18
Q

Where is the optic chiasm located?

A

Middle cranial fossa

Below the hypothalamus

19
Q

What part of the brain lies in close relation to the optic chiasm?

A

Pituitary Gland

20
Q

What symptom/sign does compression of the optic chiasm lead to?

A

Bitemporal Hemianopia

21
Q

What is bilateral hemianopia?

A

Visual defect in the peripheral fields on both eyes

22
Q

What cranial bone does the optic nerve travel through? What is the name of the fossa it passes through?

A

Sphenoid bone

Optic Canal

23
Q

What does the optic nerve develop from?

A

Out-pocketing of the fore-brain known as the optic vesicle

24
Q

Damage to what will cause unilateral blindness?

A

Optic Disc / nerve

25
Q

What is central scotoma?

A

A defect in the macular visual field caused by macular degeneration / macular oedema

26
Q

List some causes of bitemporal hemianopia:

A

Pituitary Adenoma
Glioma
Aneurysms
Medial Sphenoid ridge meningioma

27
Q

What is the term given for loss of visual field on the same side in both eyes?

A

Homonymous Hemianopia

28
Q

What optic tract would be damaged in left homonymous hemianopia?

A

Right optic tract

29
Q

List some causes of homonymous hemianopia?

A 
MS
Trauma
Anterior Choroidal infarct
Tumor
Stroke
Abscess
30
Q

What can be spared in occipital - related homonymous hemianopia?

A

Macula

31
Q

Define superior quadrantinopia:

A

A loss of superior quadrant visual field on the same side in both eyes

32
Q

Where will the lesion be in superior quadrantinopia?

A

Temporal Fascicle of the optic radiation

33
Q

Where will the lesion be in an inferior quadrantinopia?

A

Parietal Fascicle of the optic radiation

34
Q

Define inferior quadrantinopia:

A

Loss of inferior quadrant visual field on the same side in both eyes

35
Q

Which optic radiation would be damaged in right sided inferior quadrantinopia?

A

Left parietal optic radiation

36
Q

What can cause a unilateral visual field defect?

A

Arterial occlusion
Branch retinal vein thrombosis
Inferior retinal detachment

37
Q

A lesion of the optic tract will cause what?

A

Contralateral homonymous hemianopia

38
Q

What condition causes arcuate scotoma?

A

Moderate glaucoma

39
Q

When testing vision, what does the white pin test?

A

Peripheral vision

40
Q

When testing vision, what does the red pin test?

A

Central vision

Ophthalmology (2 decks)

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