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Neurons (also neurones or nerve cells or nerve fibers) are a major class of cells (parenchyma) in the nervous system. In vertebrates, neurons are found in the brain, the spinal cord and in the nerves and ganglia of the peripheral nervous system. Their main role is to process and transmit information. Morphologically, a prototypical neuron is composed of a cell body, a dendritic tree and an axon. In the classical view of the neuron, the cell body and dendritic tree receive inputs from other neurons, and axon transmits output signals. Neurons have excitable membranes, which allow them to generate and propagate electrical impulses. Neurons make connections with other neurons and transmit information to them via synaptic transmission. Different types of neurons have different shapes, possess specific electrical properties adopted for their function and use different neurotransmitters.
Three views of an olfactory projection neuron in the brain of an adult locust: Dorsal (top), anterior (bottom left), and lateral (bottom right). Credit: T. Miyazaki, NICHD
An NIH study has uncovered specialized mouse neurons that play a unique role in pain.
More information: www.nih.gov/news-events/news-releases/nih-study-uncovers-...
Credit: Jeremy and Nichole Swan
Les neurones à GnRH (cellules visualisées en rouges) qui naissent dans le nez au cours du développement embryonnaire, utilisent les fibres olfactives (marquage vert et bleu) pour migrer dans le cerveau jusqu'à l'hypothalamus pendant la vie fœtale. De là , ils orchestreront plus tard la fertilité.
©Vincent Prévot ; European Research Council/Agence Nationale de la Recherche Médicale/Métropole Européenne de Lille/Inserm.licence CC-BY-NC 4.0 international
Image accompagnant le communiqué de presse publié le 17 septembre 2020 : "Puberté précoce : une piste d’explication pour certains cas ?" presse.inserm.fr/puberte-precoce-une-piste-dexplication-p...
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Jusqu’à récemment, il était communément admis que c’était l’accélération de la croissance qui déclenchait la puberté. Or, une équipe de recherche de l’Inserm, du CHU de Lille et de l’Université de Lille, au sein du laboratoire Lille Neuroscience et Cognition, a découvert en 2020 chez la souris un mécanisme associé au pic de croissance prépubère et au déclenchement d’une puberté précoce. Ce mécanisme est régulé par les neurones à GnRH, les chefs d’orchestre de la fertilité, via l’expression de leur protéine Nrp1. Ces travaux, publiés dans The EMBO Journal, remettent en question les connaissances sur les déclencheurs de la puberté et ouvrent la voie à l’étude de ce mécanisme chez l’humain et à son implication possible dans certains cas de puberté précoce.
In a study conducted by NIDA intramural scientists, details of the role of glutamate, the brain’s excitatory chemical, in a drug reward pathway were identified for the first time. (Pictured –partial view of labelled neurons in reward circuitry that starts in dorsal raphe; ventral tegmental area)
Credit: National Institute of Drug Abuse, National Institutes of Health
Scientists can delay death as it spreads through cells from head to tail in the nematode worm. False memories have been planted into the minds of mice using flashes of light to trigger neurons. Stem cells integrated into the retinas of blind mice can form new photoreceptor cells. A new cancer drug, PAC-1, has treated pet dogs with cancer before starting clinical trials in humans. A biodegradable silk implant stops epilepsy progressing in rats. The Mouse Genetics Project has discovered new roles for over 900 genes related to human diseases.
Larval zebrafish are optically clear, allowing researchers to observe the nervous system as it develops and monitor the activity of neurons during behavior. In this image, 6 day-old zebrafish swim near the water's surface.
Credit: J. Swan and K. Tabor, Burgess Laboratory, National Institute of Child Health and Human Development, National Institutes of Health
A neuron has a soma (cell body) from which processes emerge. The processes that receive information from synapses are called dendrites, while the process that carry the information from the soma is called the axon. Neurons have only one axon. The axon emerges from the axon hillock and is covered by glial cells, in this case an oligodendrocyte of the CNS, that form the myelin. If the neuron was in the PNS, its axon would be covered by other glial cells called Schwann cells. Gaps between the myelin are called nodes of Ranvier. The axon ends in branches at the axon terminal and the branches enlarge at their ends to form synaptic end bulbs. (Image credit: "Labeled parts of a neuron" by Chiara Mazzasette is licensed under CC BY 4.0 / A derivative from the original work)
The stainless steel sculpture "Neuron" by Roxy Paine. Outside the Museum of Contemporary Art, Sydney for the 17th Biennale.
Transferrin receptor (TfR) is labelled red in the somatodendritic domain of hippocampal neurons. The axon initial segment (AIS) is green and F-actin protein is blue. Credit: G.G. FarÃas and J.S. Bonifacino, NICHD
Stroking the leg, and watching the electrical spikes in the nervous system.
As I rubbed the pinned cockroach leg hairs, the neuron spikes were visible on the iPad. They have a simple single neuron per hair system to jack into.
We then ran it backward, and got the leg to dance to a hip hop tun. I wanted to teach it jiu-jitsu. =)
"The real truth of the matter is, as you and I know, that a financial element in the larger centers has owned the Government ever since the days of Andrew Jackson."
– Franklin D. Roosevelt, letter to Col. Edward Mandell House (21 November 1933)
"Aphorisms are short, pithy sayings; they are individual passages that can be recited and remain intelligible out of context; they can stand on their own without further support."
– Dr. Louis Groarke
"The antagonism between science and religion, about which we hear so much, appears to me to be purely factitious — fabricated, on the one hand, by short-sighted religious people who confound a certain branch of science, theology, with religion; and, on the other, by equally short-sighted scientific people who forget that science takes for its province only that which is susceptible of clear intellectual comprehension; and that, outside the boundaries of that province, they must be content with imagination, with hope, and with ignorance."
– Thomas Huxley, "The interpreters of Genesis and the interpreters of Nature" (1885).
Central Station area, Newcastle upon Tyne, Tyne and Wear, England, UK
Neuron Scooters
These small battery powered personal travelling devices are available for hire throughout the city. Their sturdy design is proof aginst the Geordie destroyers of everything nice.
Central Station Area
John Dobson built the largest and busiest railway station in the region. Queen Victoria opened it in 1850. The North Eastern Railway's chief architect, Thomas Prosser, added the port cochère (portico) later.
The area around the station is a focus for taxis, buses and hotels. Retail and pubs abound here.
Photographic Information
Taken on 2nd June, 2024 at 1330hrs with a Nikon Coolpix S3300 digital compact camera, post-processed with Adobe Photoshop CS5.
© Timothy Pickford-Jones 2024
A fluorescent microscopic image of neural precursors generated from human embryonic stem cells. The neural cell bodies are visible in red and the nuclei in blue.
This photo was taken in the lab of Xianmin Zeng at the Buck Institute for Age Research.
Learn more about CIRM-funded stem cell research: www.cirm.ca.gov
Neurons receive input from other neurons through synapses, most of which are located along the dendrites on tiny projections called spines.
Two NIH-funded studies in mice are offering a possible answer about what makes sleep essential to good health. The two research teams used different approaches to reach the same conclusion: the brain’s neural connections grow stronger during waking hours, but scale back during snooze time. This sleep-related phenomenon apparently keeps neural circuits from overloading, ensuring that mice (and, quite likely humans) awaken with brains that are refreshed and ready to tackle new challenges.
More information: directorsblog.nih.gov/2017/02/14/how-sleep-resets-the-brain/
Credit: The Center for Sleep and Consciousness, University of Wisconsin-Madison School of Medicine
This image is not owned by the NIH. It is shared with the public under license. If you have a question about using or reproducing this image, please contact the creator listed in the credits. All rights to the work remain with the original creator.
NIH funding from: National Institute of Mental Health; National Institute of Neurological Disorders and Stroke; National Institute of General Medical Sciences
A neuron from the AIs of the future?
This has NOT been photoshopped.
Was created using long exposure and various LED lights.
www.medical-explorer.com/alzheimers.php
Hallmarks of Alzheimer's disease include neuritic plaques,(outside neurons), and neurofibrillary tangles (inside eurons).
During last year's Biennale, Roxy Paine's work, called Neuron, was given a deservably prominent position on the forecourt of the Museum of Contemporary Art
More information: directorsblog.nih.gov/2016/07/14/snapshots-of-life-making...
This image is not owned by the NIH. It is shared with the public under license. If you have a question about using or reproducing this image, please contact the creator listed in the credits. All rights to the work remain with the original creator.
Credit: Ken Chan and Viviana Gradinaru Group, Caltech
NIH funding from: Common Fund; National Institute on Aging; National Institute of Neurological Disorders and Stroke; National Institute of Mental Health; National Institute of General Medical Sciences
Human embryonic stem cells differentiated into dopaminergic neurons after being exposed to a mix of synthetic compounds. Red indicates the protein beta-tubulin III, which is found in the dopaminergic neurons that degenerate in Parkinson's disease. Blue indicates nuclei. This work could lead to more efficient ways of generating dopaminergic neurons to study the origins and possible treatments for Parkinson's disease.
This photo was taken by Andrei Kochegarov in the lab of Michael Pirrung at the University of California, Riverside.
Learn more about CIRM-funded stem cell research: www.cirm.ca.gov
Pencil drawing of Neurons with artistic liberty. (Not scientific drawing.)
color pencil on paper
4.5" x 5.5"
A fluorescent microscopic image of neural precursors generated from human embryonic stem cells. The neural cell bodies are visible in red and the nuclei in blue.
This photo was taken in the lab of Xianmin Zeng at the Buck Institute for Age Research.
Learn more about CIRM-funded stem cell research: www.cirm.ca.gov