2. Topography 2 Flashcards
Lower and upper radiations of Meyers loop end up in?
Lower : Lower Cortex
Upper: Upper Cortex
Lower radiations pass through Meyer’s loop, why?
To avoid lateral ventricles- because it is filled with fluid and should not be invaded.
Meyers loop is also called?
Temporal Lobe
Meyers loop is also called?
Temporal Lobe
Damage to Meyer’s loop produces?
Pie in the sky defect
Damage to Meyer’s loop produces?
Pie in the sky defect
2 principle columns of the hyper column?
LE dorminant
RE dorminant
1st point where convergence of binocular info is seen in the visual cortex?
In the hyper columns
Stereo vision depends on?
Disparity
What is required to have binocular correspondence?
Eyes need to be aligned
In strabismus- suppression of 1 eye by the cortex is done by?
Done by back projection to LGN
Is info aligned in the case of monocular crescent?
No
Cortex has how many layers?
Which layer is primary layer?
6
Primary layer = 4
Magno and Parvo move to which layers in the cortex?
Magno moves to 4C alpha
Parvo moves to 4C beta
Input layer for magno and parvo?
4C
3 TARGETS in the cortex for konio layers?
4A, layer 2, blobs
What is Retina-Geniculate system relate to?
Relates to primary visual system
Info moves from retina –> LGN –> Striate cortex
Site of conscious vision in humans?
Cortex
Huge amount of cortex is devoted to?
Macular and foveal vision
Role of sulcus in cortex
Upper from lower visual cortex
2 factors relating to cortical magnification and resolution- center vs periphery?
Many photoreceptors passing foveal info at the center compared to the periphery.
More convergence of photoreceptors at the periphery compared to the center.
What type of defect only occurs in cortical lesions and never seen in optical radiation lesions?
Macular sparing
