Visual System Flashcards
The visual system pathways are what two systems?
Ventral visual system
Dorsal visual system
The ventral visual stream (perception stream) is the?
Who/what pathway
- Primary visual cortex - secondary visual cortex
- General interpretation - movement - color - general properties
What is for specific interpretation of who or what it is you are looking at?
Inferotemporal cortex
The dorsal visual stream (action stream) is the/
Where/how pathway
- parimary visual cortex - secondary visual cortex - posterior parietal cortex
- spatial localization
Other pathways bypass the LGN and primary visual cortex and are important for?
unconscious visual information
What is the hypothalamus?
unconscious awareness and reflex responses
Sleep cycles and circadian rhythm
Superior colliculus goes to which CN?
CN III Oculomotor
CN IV Trochlear
CN VI Abducens
CN XI Accessory
-Guide eye and head movements in response to visual inputs
What is high speed eye movements when moving from one object to another?
Saccades
What is eye movement following a moving object?
Smooth pursuits
What is loss of contralateral 1/2 of visual field in both eyes? Injury to: -One optic tract -One LGN -Superior and inferior optic radiations -One primary visual cortex
Homonymous Hemianopia
What is loss of lateral/temporal visual field in both eyes?
Injury to:
-Center of optic chiasm
Bitemporal hemianopia
Loss of contralateral and inverted by 1/4 visual field in both eyes? Injury to: -Superior optic radiation -Inferior optic radiation -One bank of the calcarine fissure
Homonoymous Quadrantanopia
Loss of vision in one eye?
-Damage to the eye or the optic nerve?
Ipsilateral blindness
