Lect 4 VF Flashcards
The optic tract is ____ in relation to the optic chiasm?
a) superior
b) inferior
c) anterior
d) posterior
d) posterior (**do not get confused, the optic nerve is anterior to the chiasm, the optic tract is posterior to the chiasm)
Which one of the following is true regarding Von Willebrand’s knee?
a) It is a portion of TEMPORAL fibers that dips into the opposite side of the optic nerve at the chiasm
b) It is a portion of SUPERIOR NASAL fibers that dips into the opposite side of the optic nerve at the chiasm
c) It is a portion of SUPERIOR TEMPORAL fibers that dips into the opposite side of the optic nerve at the chiasm
d) It is a portion of INFERIOR NASAL fibers that dips into the opposite side of the optic nerve at the chiasm
d) It is a portion of INFERIOR NASAL fibers that dips into the opposite side of the optic nerve at the chiasm. (this will show a SUPERIOR TEMPORAL VF defect)
The optic tract contains:
a) half temporal fibers of the ipsilateral eye and half nasal fibers of the ipsilateral side
b) half temporal fibers of the ipsilateral eye and half nasal fibers of the contralateral side
c) half temporal fibers of the contralateral eye and half nasal fibers of the ipsilateral side
d) half temporal fibers of the contralateral eye and half nasal fibers of the contralateral side
b) half temporal fibers of the ipsilateral eye and half nasal fibers of the contralateral side
Which one of the following would NOT pertain to a “pie in the sky” defect?
a) superior visual field
b) meyers loop: temporal lobe
c) inferior retina fibers
d) loop in posterior parietal lobe
d) loop in posterior parietal lobe
Which one of the following would NOT pertain to a “pie on the floor” defect?
a) inferior visual field
b) meyers loop: temporal lobe
c) superior retina fibers
d) loop in posterior parietal lobe
b) meyers loop: temporal lobe
Match the defects to the following lesion sites:
1) bitemporal hemanopsia
2) homonymous hemanopsia
3) mononuclear field loss
4) superior homonymous quadrantopia “pie in the sky”
5) inferior homonymous quadrantopia “pie on the floor”
6) homonymous hemanopsia with macular sparing
a) optic nerve
b) temporal lesion
c) optic tract
d) optic chiasm
e) parietal lesion
f) optic radiation
1) bitemporal hemanopsia–d) optic chiasm
2) homonymous hemanopsia–c) optic tract
3) mononuclear field loss–a) optic nerve
4) superior homonymous quadrantopia “pie in the sky”–b) temporal lesion
5) inferior homonymous quadrantopia “pie on the floor”–e) parietal lesion
6) homonymous hemanopsia with macular sparing–f) optic radiation
(T/F) Lesions of the optic nerve are bilateral
false, they are unilateral (remember the optic nerve only extends to the chiasm and becomes the optic tract posterior to the chiasm)
Which one of the following is NOT a sign associated with chiasmal disease?
a) optic atrophy
b) RAPD
c) VF defect
d) dyschromatopsia
e) diplopia if cavernous sinus is involved
f) may/may not have endocrine dysfunction
g) all of the above are signs associated with chiasmal disease
g) RAPD (RAPD is a relevent afferent pupillary defect, meaning you are comparing the 2 eyes. a lesion at the chiasm would cause equal pupillary damage to both eyes, therefore no RAPD)
Match the following syndromes to their respective clinical findings:
1) anterior chiasmal syndrome
2) posterior chiasmal syndrome
3) middle chiasmal syndrome
4) lateral chiasmal syndrome
a) binasal hemanopia
b) bitemporal hemanopia
c) central bitemporal hemanopic defect (nasal macular fibers)
d) ipsilateral central scotoma, contralateral superior temporal defect
1) anterior chiasmal syndrome–d) ipsilateral central scotoma, contralateral superior temporal defect (due to compression of Von Willebrand’s knee)
2) posterior chiasmal syndrome–c) central bitemporal hemanopic defect (nasal macular fibers)
3) middle chiasmal syndrome–b) bitemporal hemanopia
4) lateral chiasmal syndrome–a) binasal hemanopia
(T/F) Middle cerebral artery infart causes congrous homonymous hemanopia w/ macular sparing
true
The hill of vision is largest on the ______ side:
a) superior
b) inferior
c) nasal
d) temporal
d) temporal (because we have largest field of view on our temporal side 100 degrees. Superior is 60, inferior is 75, and nasal is 60 degrees)
Your optic nerve blind spot is:
a) 15 degrees temporal
b) 15 degrees nasal
c) 20 degrees nasal
d) 20 degrees superior
a) 15 degrees temporal (your optic nerve blind spot is 15 degrees temporal because your optic nerve is 15 degrees nasal and visual fields are flipped from retina)
Which one of the following best describes a centro-cecal VF defect?
a) centrally located
b) anywhere near the center
c) including the center and extending to the optic nerve
d) enlarged optic nerve
c) including the center (macula) and extending to the optic nerve (blind spot)
Which one of the following is correct visual pathway?
a) retinal ganglion cells, optic nerve, chiasm, optic tract, optic radiations, LGN, Visual cortex
b) retinal ganglion cells, optic nerve, chiasm, optic tract, LGN, optic radiations, Visual cortex
c) retinal ganglion cells, optic tract, chiasm, optic nerve, LGN, optic radiations, Visual cortex
d) retinal ganglion cells, optic nerve, chiasm, optic tract, optic radiations, Visual cortex, LGN
b) retinal ganglion cells, optic nerve, chiasm, optic tract, LGN, optic radiations, Visual cortex
Whic one of the following is NOT true regarding chiasmal anatomy?
a) contains crossed nasal and uncrossed temporal fibers
b) lies below the sella turcica
c) ICA and cavernous sinus lie inferior and lateral to the chiasm
d) pituitary gland is inferior to the chiasm
b) lies below the sella turcica (FALSE, the chiasm lies above the sella turcica which houses the pituitary gland. The chiasm lies below the hypothalamus and floor of the 3rd ventricle)
