Alzheimer's disease. Coloured axial magnetic resonance imaging (MRI) scan of the brain of a 65- year-old patient with Alzheimer's disease. The front of the brain is at top in this view from below. The progression of this degenerative disease has caused atrophy in both halves of the brain, but especially at upper right and upper left (brown areas). The ventricles (centre, purple) have also been affected and are dilated from their normal size. The causes of Alzheimer's are poorly understood, but it is associated with the formation of plaques of an insoluble protein (amyloid) in the brain, and decreased levels of the neurotransmitter acetylcholine. It is incurable, but the symptoms can be treated with drugs to raise acetylcholine levels.

Photo website with Rights Managed and Royalty Free stock photos, images, illustrations and footage available for download immediately for commercial and editorial uses. Aflo is a leading independent supplier and producer of stock pictures and visual content. Search and find high quality images and video for design, print, web-use and publishing. Buy photos from our extensive collection of model released and property released sports images. Search some of the most beautiful travel and landscape pictures from our own photographers and license from our large collection of content, modern and archive, focusing on Japan. We provide free research. Register for personal account management and for full use of our Stock Photography website and start to download images now.