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Astrocytes

Khan AcademyMatthew Barry Jensen

The human brain is a vast network of billions of neurons. For more than a century, that dizzyingly complex neuronal code was thought to be the sole arbiter of perception, thought, emotion, and behavior, as well as related health conditions. If you wanted to understand the brain, you turned to the study of neurons: neuroscience. But a recent body of work from several labs provides the strongest evidence yet that a narrow focus on neurons is woefully insufficient for understanding how the brain wo

The human brain is a vast network of billions of neurons. For more th…

13.4K views1 month ago

FacebookQuanta Magazine

This video changed how we understand the brain. In the late 1980s, neuroscientists were trying to understand how neurons respond to glutamate. A lab using one of the first digital fluorescence video microscopes recorded calcium activity as a proxy for cellular signaling. Astrocytes were included in the culture only because neurons do not survive well without them. When glutamate was added (added at second 1), neurons behaved as expected. But something unanticipated happened alongside them: calci

This video changed how we understand the brain. In the late 1…

31.1K views1 month ago

FacebookWilliam Wallace, Ph.D.

The glymphatic system is a waste-clearance network in the brain that removes metabolic byproducts and toxins, including proteins such as beta-amyloid, by flushing cerebrospinal fluid through brain tissue. It operates primarily during sleep, when brain cells shrink slightly to allow fluid to flow more efficiently along perivascular channels formed by glial cells (especially astrocytes). By clearing waste and maintaining chemical balance, the glymphatic system plays a critical role in brain health

The glymphatic system is a waste-clearance network in the brain tha…

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Specialized astrocytes called protoplasmic astrocytes make contact with vessels creating a pathway for nutrients to enter the brain. Stock Video

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In the human brain there are approximately 1.5 trillion astrocytes making them the most abundant cell type in the central nervous system.

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