What is Magnocellular and Parvocellular pathways?
The magnocellular and parvocellular pathways (M and P pathways) are the major pathways of the visual system, accounting for most of the axons that leave the retina and the perceived vision, as demonstrated by loss of vision when the pathways are destroyed.
What are the different types of dementia?
Types of Dementia
- Alzheimer’s Disease.
- Vascular Dementia.
- Dementia With Lewy Bodies (DLB)
- Parkinson’s Disease Dementia.
- Mixed Dementia.
- Frontotemporal Dementia (FTD)
- Huntington’s Disease.
- Creutzfeldt-Jakob Disease.
What’s the worst type of dementia?
Creutzfeldt-Jakob disease causes a type of dementia that gets worse unusually fast. More common causes of dementia, such as Alzheimer’s, Lewy body dementia and frontotemporal dementia, typically progress more slowly. Through a process scientists don’t yet understand, misfolded prion protein destroys brain cells.
What causes retinal ganglion cell death?
RGC die by caspase-dependent mechanisms, including apoptosis, during development, after ocular injury and in progressive degenerative diseases of the eye and optic nerve, such as glaucoma, anterior ischemic optic neuropathy, diabetic retinopathy and multiple sclerosis.
What happens if ganglion cells are damaged?
Quigley, MD (Wilmer Eye Institute, Johns Hopkins Medicine), “Ganglion cells are damaged by prolonged eye wall stress and this is the cause of damage to your vision in glaucoma. This means that the higher the pressure, the greater the chance for glaucoma. However, not everyone’s eyes react to pressure in the same way.”
What does the magnocellular layer do?
Function. The magnocellular pathway cannot provide finely detailed or colored information, but still provides useful static, depth, and motion information. This information is also useful for detecting the difference in positions of objects on the retina of each eye, an important tool in binocular depth perception.