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Primary visual cortex
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- 1How many cell layer are there in the primary visual cortex?6 layers (layer 4 with subdivisions A,B,Cα,Cβ).
- 2Which types of neuron cells are present in the primary visual cortex?Granule & pyramidal cells
- 3What is in layer 1 of the V1 cortex?Dentrites and synapses
- 4Where is the primary visual cortex located in the occipital lobes?Brodmann area 17. Medial, upper & lower banks of the calcarine sulcus in each hemisphere. They present the opposite hemi-field
- 5What type of cells are in layers 2.3.4A, 4B, 5 and 6?Pyramidal cells
- 6What type of cells are in layer 4C?Granule cells
- 7Why is V1 called the striate cortex?Because layer 4B contains a band/stripe of myelinated axons.
- 8What is the name given for unilateral damage to one hemisphere?Hemi-anopsia (if damage is done to the left side of V1, it is called right hemianopia)
- 9Which layer of V1 recieves input from the LGN and connects to cells in the layers above and below?Layer 4Cα,Cβ
- 10Where do the different layers axons connect to?Layer 4c recieve input from LGN, 2-4B connect to other nearby extrastriate areas of V1, 5 & 6 have descending sub-cortical connections (e.g. layer 6 back to the LGN)
- 11What are the blobs and inter blob zones in V1?The blobs are columns in the layers above and below layer 4c which are uniformly cytochrome oxidase rich. Inter blobs have less CO. CO is a metabolic enzyme in the mitochondria.
- 12What are the functions of interblob and blob cells?BLobs are colour selective whereas interblobs are contour-selective responding to different lines or edges.
- 13Which V1 cells are inhibitory and influence RF properties of pyramidal cells and where are they located?Basket cells & chandelier cells are located in most cell layers.
- 14What is the parallel image processing pathway beginning from the midget ganglion cells (P pathway)?Midget --> Parvocellular pathway of LGN --> 4Cβ --> blob cells & interblob cells
- 15What is the parallel image processing pathway beginning from the parasol ganglion cells?Parasol --> Magnocellular pathway of LGN --> 4Cα --> layer 4B & interblob cells
- 16What is the parallel image processing pathway beginning from the Small bi-stratified ganglion cells?Small bi-stratified --> koniocellular pathway of LGN --> 4Cα --> blob cells
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- Degree Visual science Fichas sobre Primary visual cortex, creado por ghada.hamdi.1 el 27/10/2015.
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