Loading…
Logo Medical Art Library

Alzheimer's Disease

Display this animation on your web site today! Click to find out how.
ID: ANM11034
MEDICAL ANIMATION TRANSCRIPT: The brain's cognitive functions include memory, which is the process of information retention and retrieval. Memories form in the hippocampus, which consists of information-processing cells called neurons. Each neuron receives chemical messages from other neurons via dendrites, then converts the message to an electrical charge called an action potential. In the space between them, neurons release stimulatory chemicals called neurotransmitters, which bind with receptors on the receiving cell and transfer information. Alzheimer's disease is a gradual, degenerative brain condition in which neurons in the memory and other cognitive areas of the brain lose function and die, resulting in progressive memory loss first, then difficulties learning and communicating, and, eventually, failing basic functions like breathing. In healthy neurons, enzymes help process a protein called amyloid precursor protein into fragments which help with normal cell function. In Alzheimer's, abnormal enzymatic processing produces fragments that include a sticky peptide called beta amyloid. Beta amyloid accumulates in the extracellular space, forming clumps called amyloid plaques. These clumps block the electrical and chemical connections between neurons. Inside healthy neurons, microtubules and tau proteins form an orderly structure that carries ions and nutrients within the cell. In Alzheimer's, chemical changes inside the neurons damage tau, twisting microtubules abnormally into neurofibrillary tangles, which disrupts ion and nutrient delivery within the cell. As the plaques and tangles multiply throughout brain tissue, neural connections diminish, and the malnourished cells lose function, resulting in widespread neural death, reduced brain mass, and severe cognitive and functional impairment. There is no cure for Alzheimer's, but current treatments include cholinesterase inhibitors, which delay the breakdown of acetylcholine, a neurotransmitter important for memory and learning, and antiglutamatergic medications, which regulate the activity of glutamate, another neurotransmitter essential for memory and learning, by blocking excessive glutamate binding to neurons, thus preventing neuronal dysfunction and death. ♪ [music] ♪
Variations
    (none available)

Nucleus Medical Media Disclaimer of Medical and Legal Liability

Nucleus Medical Media ("Nucleus") does not dispense medical or legal advice, and the text, illustrations, photographs, animations and other information ("Content") available on this web site is for general information purposes only. As with any medical or legal issue, it is up to you to consult a physician or attorney for professional advice. YOU SHOULD NOT DISREGARD PROFESSIONAL MEDICAL OR LEGAL ADVICE BASED ON CONTENT CONTAINED ON THIS WEB SITE, NOR SHOULD YOU RELY ON THE CONTENT ON THIS WEB SITE IN PLACE OF PROFESSIONAL MEDICAL OR LEGAL ADVICE.

NUCLEUS DISCLAIMS ALL RESPONSIBILITY AND LIABILITY FOR ANY COUNSEL, ADVICE, TREATMENT, DIAGNOSIS OR ANY MEDICAL, LEGAL OR OTHER INFORMATION, SERVICES OR PRODUCTS THAT YOU OBTAIN BASED ON VIEWING THE CONTENT OF THIS SITE. THE INFORMATION ON THIS WEB SITE SHOULD NOT BE CONSIDERED COMPLETE OR SUITABLE FOR ANY PURPOSE WHATSOEVER.

Mature Content Disclaimer: Certain Content on this web site contains graphic depictions or descriptions of medical information, which may be offensive to some viewers. Nucleus, its licensors, and its suppliers disclaim all responsibility for such materials.

close