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Neuro - Visual 3

The role of the superior colliculus is to:

orient the movement of head and eyes

The role of the pretectum is:

reflex control of pupil and lens

Which structure mediates circadian entrainment to light?

suprachiasmatic nucleus

SCN

True or False: Retinal photoreceptors are required for circadian photorecption

false

Which pigment is expressed by a small population of intrinsically photosensitive retinal ganglion cells (ipRGC) that respond directly to light?

melanopsin

Retinal ganglion cells containing melanopsin innervate which brain structure?

superchiasmatic nucleus

SCN

Does an afferent pupillary defect result in the eyes having the same response to the swinging light test (ie. dilation, dilation) or different responses (ie. dilation, constriction)?

same

same response

Would an aneurysm at the ciliary ganglion result in an afferent pupillary defect or an efferent pupillary defect?

efferent

efferent pupillary defect

Which of the following would you expect to result in a consensual lack of dilation in response to light?

inflammation of the optic nerve

lesion in the pretectal nucleus

True or False: Sensory and motor information is topographically organized in the superior colliculus

true

The ability to respond to visual stimuli despite being blind is known as ______

blindsight

Which of the following apply to P type ganglion cells?

small receptive fields

make up the majority of ganglion cells

sustained firing of APs

True of False: P ganglion cells are important for high temporal resolution while M ganglion cells are important for high spatial resolution

false

True or False: The left primary visual cortex only gets information from the right eye

false

True or False: The right primary visual cortex gets input from both eyes, but only from the left visual field

true

True or False: The nasal retina crosses the optic chiasm (contralateral) while the temporal retina does not cross the optic chiasm (stays ipsolateral)

true

Select the correct anatomical sequence that info from the retinas would travel along:

L nasal retina, L optic nerve, optic chiasm, R optic tract

A lesion of the right optic nerve would result in a deficit of:

the right visual field

A lesion of the optic chiasm would result in a deficit of:

the left temporal and right temporal hemifields

Most axons in the optic tract terminate at which brain structure?

lateral geniculate nucleus

the lateral geniculate nucleus

LGN

the LGN

How many layers does the LGN have?

six

6

True or False: P type ganglion cells project exclusively to the 4 parvocellular layers of the LGN, while M type ganglion cells project exclusively to the 2 magnocellular layers of the LGN

true

True or False: Each of the 6 layers of the LGN receives info from both contralateral visual fields

true

The right LGN would receive info from which visual fields?

left nasal retina and right temporal retina

True or False: Axons carrying info about the inferior visual field travel through Meyer's loop in the temporal lobe before reaching the occipital lobe

false

A stroke at the tip of Meyer's loop would result in deficits at the superior portion of the left visual fields for both eyes. True or False?

true

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