Lateral Geniculate Nucleus | Cheat Sheet - Edubirdie

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

2024
Views:

74

Pages:

2
Author:

Mariam A.

Retina  lateral geniculate nucleus    First decussation of visual input occurs at lens. The visual input from both eyes partially decussate at the optic chiasm. o Information of the temporal retina (the nasal lens) remains on the ipsilateral side. o Information of the nasal retina (the temporal lens) crosses to the contralateral side. Fibres travel back to the lateral geniculate nucleus (in the thalamus) as the first stage of the main visual pathway to the brain. o Does so through the optic canal. o Information is also sent to the superior colliculus to drive other functions, such as saccadic movement.  The lateral geniculate is made up of 6 layers of cells. C=contralateral; I = ipsilateral  o Magnocellular layers (1 and 2) and parvocellular layers (3 – 6). o Therefore, information from the eyes project to specific layers, both in terms of function (magnocellular vs. parvocellular) and layers (right eye vs. left eye). Different cell types of the retina project to different layers: o Midget ganglion cells project to the parvocellular layers, and are associated with high spatial acuity and spatial contrast. o Parasol ganglion cells project to the magnocellular layers, and are related to motion. o Some ganglion cell types project to layers (intercalated layers) that are in between the two.

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