News tagged with nerve fibers
(Medical Xpress)—One way to increase our understanding of bilateral brains, like our own, is to inspect their paired sensory systems. In our visual system, the optic nerves normally combine at a place called ...
Neuroscience Apr 15, 2013 | 5 / 5 (2) | 0 |
(Medical Xpress)—Gastric banding, a common surgery to reduce obesity, leaves much to be desired. Typically, the patient is left with a feeling of constant hunger. Stimulators implanted in the feeding centers ...
Overweight and Obesity Apr 09, 2013 | 4.8 / 5 (4) | 1 |
Reduced production of myelin, a type of protective nerve fiber that is lost in diseases like multiple sclerosis, may also play a role in the development of mental illness, according to researchers at the Graduate School of ...
Neuroscience Nov 28, 2012 | 4.2 / 5 (5) | 1 |
(HealthDay)—A new pill can help prevent relapse in some people with multiple sclerosis (MS), new research indicates.
Neuroscience Sep 19, 2012 | 5 / 5 (3) | 0 |
A growing body of research shows that children who suffer severe neglect and social isolation have cognitive and social impairments as adults. A study from Boston Children's Hospital shows, for the first time, how these functional ...
Neuroscience Sep 13, 2012 | 5 / 5 (1) | 2 |
Study shows omega-3 fatty acid, curry spice repair tissue damage, preserve walking in rats with spinal-cord injury
UCLA researchers discovered that a diet enriched with a popular omega-3 fatty acid and an ingredient of curry spice preserved walking ability in rats with spinal-cord injury. Published June 26 in the Journal of Neurosurgery: Sp ...
Neuroscience Jun 26, 2012 | 5 / 5 (4) | 1 |
The brain receives information from the ear in a surprisingly orderly fashion, according to a University at Buffalo study scheduled to appear June 6 in the Journal of Neuroscience.
Neuroscience Jun 05, 2012 | 4.8 / 5 (8) | 1 |
(Medical Xpress) -- Researchers from Japan recently published a paper in PLoS One describing their successful growth and transplantation of new teeth created from the stem cells of mice.
Medical research Jul 13, 2011 | 4.9 / 5 (23) | 8 |
(Medical Xpress)—Working with lab mice models of multiple sclerosis (MS), UC Davis scientists have detected a novel molecular target for the design of drugs that could be safer and more effective than current FDA-approved ...
Alzheimer's disease & dementia May 17, 2013 | 5 / 5 (2) | 0 |
(Medical Xpress)—Some parts of the body, like the liver, can regenerate themselves after damage. But others, such as our nervous system, are considered either irreparable or slow to recover, leaving thousands ...
Neuroscience May 13, 2013 | 5 / 5 (8) | 1 |
By monitoring the behavior of a class of cells in the brains of living mice, neuroscientists at Johns Hopkins discovered that these cells remain highly dynamic in the adult brain, where they transform into ...
Neuroscience May 09, 2013 | 5 / 5 (2) | 0 |
Scientists have identified an influential link in a chain of events that leads to autoimmune inflammation of the central nervous system in a mouse model of multiple sclerosis (MS).
Medical research May 02, 2013 | 5 / 5 (4) | 0 |
The initial clinical trial of a novel approach to treating amyotrophic lateral sclerosis (ALS) – blocking production of a mutant protein that causes an inherited form of the progressive neurodegererative disease – may ...
Neuroscience Apr 03, 2013 | 5 / 5 (1) | 0 |
New research from the Massachusetts Eye and Ear, Harvard Medical School and Harvard Program in Speech and Hearing Bioscience and Technology may have discovered a key piece in the puzzle of how hearing works by identifying ...
Neuroscience Mar 27, 2013 | not rated yet | 0 |
A new, implantable device for treating chronic pain passes an important safety test.
Medical research Mar 25, 2013 | 5 / 5 (3) | 0 |
An axon or nerve fiber is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma.
An axon is one of two types of protoplasmic protrusions that extrude from the cell body of a neuron, the other type being dendrites. Axons are distinguished from dendrites by several features, including shape (dendrites often taper while axons usually maintain a constant radius), length (dendrites are restricted to a small region around the cell body while axons can be much longer), and function (dendrites usually receive signals while axons usually transmit them). All of these rules have exceptions, however.
Some types of neurons have no axon—these are called amacrine cells, and transmit signals from their dendrites. No neuron ever has more than one axon; however in invertebrates such as insects the axon sometimes consists of several regions that function more or less independently of each other. Most axons branch, in some cases very profusely.
Axons make contact with other cells—usually other neurons but sometimes muscle or gland cells—at junctions called synapses. At a synapse, the membrane of the axon closely adjoins the membrane of the target cell, and special molecular structures serve to transmit electrical or electrochemical signals across the gap. Some synaptic junctions appear partway along an axon as it extends—these are called en passant ("in passing") synapses. Other synapses appear as terminals at the ends of axonal branches. A single axon, with all its branches taken together, can innervate multiple parts of the brain and generate thousands of synaptic terminals.
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