Lateral Geniculate And Occipitak Lobe - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

254

Pages:

4
Author:

Mariam A.

Lateral geniculate  occipital lobe    Segregations of the LGN still occurs in pathways that go back to the occipital lobe. There are two divisions of the pathway: o Projections that go straight from the lateral geniculate nucleus to the occipital lobe represent bottom half of the visual field. o Projections that run to the temporal lobe (Meyer’s loop) first before going to the occipital lobe represent upper half of the visual field. In the occipital lobe, there is a disproportionate area allocated to the pathways when compared to area of the eye. o Fovea is represented over a relatively larger area of V1 than more peripheral retina regions. This is associated with less convergence and smaller receptive fields, and hence higher acuity. Organisation of layers  Ocular dominance columns. o The visual cortex receives input from both left and right eye. o Information received is organized in an alternating fashion.  Laminar structure. o Each functional type of cell (magno- and parvocellular layers) project to particular parts of input layers.  Orientation columns. o Found within the ocular dominance columns. o Each column has a particular preference to orientation of the stimulus. o There is maximal activation when orientation is aligned correctly. o Therefore, it is not only related to the input from each eye, vision is also related to certain features (e.g. orientation of stimulus).  Blobs. o Overlayed onto the orientation columns. o Related to colour.  All the parameter maps overlay to create a “module” encoding all parameters.

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