T8.4: Visual Pathways Flashcards
Ahmed can’t sleep cause he stays up all night staring at his computer thinking up juvenile and asinine memes to incorporate into his MCQs. This tomfoolery results in him roughly making one MCQ ever 3.7 hours. This nocturnal behavior has interfered with which nucleus ?
A. Lateral geniculate nucleus
B. Suprachiasmatic nucleus
C. Pretectal nucleus
D. Superior colliculus
RFA
Ans. B- Suprachiasmatic nucleus- biological rhythms & sleep (hypothalamus)
A. Lateral geniculate nucleus- primary visual cortex (Occipital lobe)
C. Pretectal nucleus- pupillary light reflex(midbrain)
D. Superior colliculus- automatic saccades (midbrain)
A cool dude is riding a skateboard. He attempts to pull off a super sick nasty triple 360 ollie boneless mainecoon flip deluxe. He fails miserably slamming his face into the unforgiving concrete. He is rushed to the ER and during examination it is noted that the left superior quadrant is of vision is lost. What is damage.
A. Optic Chiasm B. Right Optic Tract C. Left Optic Tract D. Right Meyer Loop E. Left Meyer Loop F. Right Baum Loop G. Left Baum Loop
RFA
Ans. D. Right Meyer Loop- damage here= left superior Quadrant loss
A. Optic Chiasm= Tunnel Vision
B. Right Optic Tract= Left hemifield loss
C. Left Optic Tract= Right hemifield loss
E. Left Meyer Loop right superior quad loss
F. Right Baum Loop= Left inferior quad loss
G. Left Baum Loop= Right inferior quad loss
Carl has been losing his vision. He goes to the doctor and a MRI scan in performed. The MRI shows a distinct malignant growth on the most anterior portion of the cuneus gyrus. Which area or vision is Carl losing.
A. superior macula B. superior binocular C. Superior monocular D. Inferior monocular E. Inferior binocular F. Inferior macula
RFA
Ans. D. Inferior monocular- cuneus gyrus (6)
A. Superior macula- lingual gyrus(1)
B. superior binocular- lingual gyrus( 2)
C. Superior monocular-lingual gyrus(3)
E. inferior binocular- cuneus gyrus(5)
F. Inferior macula- cuneus gyrus(4)
Damage to the left superior bank of the calcarine fissure results in the loss of visual fields and is called… (MG)
A. Superior right homonymous quadrantanopia
B. Inferior left homonymous quadrantanopia
C. Superior left homonymous quadrantanopia + macular sparing
D. Inferior right homonymous quadrantanopia + macular sparing
D. Inferior left homonymous quadrantanopia + macular sparing
See pg 283 in Essential Neuroscience for complete list and cartoon of all optical field effects and lesions.
Damage to the left optic tract posterior to the optic chiasm results in which of the following visual field deficits? (MG) A. right homonymous hemianopia B. left homonymous hemianopia C. nonhomonymous bitemporal hemianopia D. total loss of vision in the left eye
A. right homonymous hemianopia
See pg 283 in Essential Neuroscience for complete list and cartoon of all optical field effects and lesions.
A patient with superior left homonymous quadrantoanopia would have a lesion in which area of the cerebrum? (MG) A. Right temporal lobe B. Left temporal lobe C. Right parietal lobe D. Left parietal lobe
A. Right temporal lobe
See pg 283 in Essential Neuroscience for complete list and cartoon of all optical field effects and lesions.
Destroying areas 3 and 6 of the Right V1 area will produce a black area in which part of your visual field?
A) Inferior Right Visual Field
B) Superior and Inferior Left Macula
C) Superior Bionocular portion of Left Visual Field
D) Inferior monocular portion of Right Visual Field
E) Superior and Inferior monocular portions of Left Visual Field
Answer = E
V1 is another name for primary visual cortex. it is divided into 6 parts. 6 and 3 are the inferior and superior monocular portions respectively, 2 and 5 are the inferior and superior binocular portions, 1 and 4 are the superior and inferior macular portions.
Magno tract is associated with _____ and ______ at layers 1 and 2
Parvo tract is associated with ______ and ______ at layers 3,4,5,6
Magno tract is associated with depth and motion
Parvo tract is associated with form and color
