Optic Tract Anatomy

Question 1

Where is the visual cortex located?

Answer 1

The most posterior part of the occipital lobe

Question 2

What fissure does the visual cortex lie beside?

Answer 2

The calcarine fissure

Question 3

Which lobe does Meyer’s loop pass through?

Answer 3

Temporal

Question 4

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

Answer 4

Upper optic Radiation

Question 5

What visual field so the Upper optic radiation correspond with?

Answer 5

Inferior visual field

Question 6

What retinal fibers are carried in the Upper Optic Radiation?

Answer 6

Superior Retinal Quadrants

Question 7

What retinal fibers are carried in the Lower Optic Radiation

Answer 7

Inferior retinal Quadrants

Question 8

What visual field does the lower optic radiation correspond with?

Answer 8

Superior Visual fields

Question 9

What does Meyer’s loop pass around?

Answer 9

The lateral ventricle

Question 10

Which optic radiation is Meyer’s loop part of?

Answer 10

Lower optic radiation

Question 11

Where do the optic radiations come from?

Answer 11

Lateral Geniculate Nucleus

Question 12

Where is the lateral geniculate nucleus?

Answer 12

Dorsal thalamus

Question 13

What fibers are contained in the Left optic tract?

Answer 13

Left temporal retina

Right nasal retina

Question 14

What fibers are contained in the Right Optic Tract?

Answer 14

Right temporal retina

Left Nasal retina

Question 15

Where is the right visual field processed?

Answer 15

Left visual cortex

Question 16

Where is the left visual field processed?

Answer 16

Right visual cortex

Question 17

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

Answer 17

The optic chiasm

Question 18

Where is the optic chiasm located?

Answer 18

Middle cranial fossa

Below the hypothalamus

Question 19

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

Answer 19

Pituitary Gland

Question 20

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

Answer 20

Bitemporal Hemianopia

Question 21

What is bilateral hemianopia?

Answer 21

Visual defect in the peripheral fields on both eyes

Question 22

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

Answer 22

Sphenoid bone

Optic Canal

Question 23

What does the optic nerve develop from?

Answer 23

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

Question 24

Damage to what will cause unilateral blindness?

Answer 24

Optic Disc / nerve

Question 25

What is central scotoma?

Answer 25

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

Question 26

List some causes of bitemporal hemianopia:

Answer 26

Pituitary Adenoma Glioma Aneurysms Medial Sphenoid ridge meningioma

Question 27

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

Answer 27

Homonymous Hemianopia

Question 28

What optic tract would be damaged in left homonymous hemianopia?

Answer 28

Right optic tract

Question 29

List some causes of homonymous hemianopia?

Answer 29

``` MS Trauma Anterior Choroidal infarct Tumor Stroke Abscess ```

Question 30

What can be spared in occipital - related homonymous hemianopia?

Answer 30

Macula

Question 31

Define superior quadrantinopia:

Answer 31

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

Question 32

Where will the lesion be in superior quadrantinopia?

Answer 32

Temporal Fascicle of the optic radiation

Question 33

Where will the lesion be in an inferior quadrantinopia?

Answer 33

Parietal Fascicle of the optic radiation

Question 34

Define inferior quadrantinopia:

Answer 34

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

Question 35

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

Answer 35

Left parietal optic radiation

Question 36

What can cause a unilateral visual field defect?

Answer 36

Arterial occlusion Branch retinal vein thrombosis Inferior retinal detachment

Question 37

A lesion of the optic tract will cause what?

Answer 37

Contralateral homonymous hemianopia

Question 38

What condition causes arcuate scotoma?

Answer 38

Moderate glaucoma

Question 39

When testing vision, what does the white pin test?

Answer 39

Peripheral vision

Question 40

When testing vision, what does the red pin test?

Answer 40

Central vision