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Topic: Efferent neuron


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In the News (Tue 16 Jul 19)

  
  ScienceDaily: Mirror neuron   (Site not responding. Last check: 2007-10-24)
A mirror neuron is a neuron which fires both when an animal performs an action and when the animal observes the same action performed by another (especially conspecific) animal.
Mirror neuron -- A mirror neuron is a neuron which fires both when an animal performs an action and when the animal observes the same action performed by another (especially conspecific) animal.
Motor neuron -- In vertebrates, motor neurons (also called motoneurons) are efferent neurons that originate in the spinal cord and synapse with muscle fibers to facilitate muscle contraction and with muscle spindles...
www.sciencedaily.com /encyclopedia/Mirror_neuron   (1517 words)

  
  Neuron - Wikipedia, the free encyclopedia
Neurons are typically 4 to 100 micrometres in diameter, the size varies depending on the type of neuron and the species it is from.
Efferent neurons transmit signals from the central nervous system to the effector cells and are sometimes called motor neurons.
Neurons communicate with one another via synapses, where the axon terminal of one cell impinges upon a dendrite or soma of another (or less commonly to an axon).
en.wikipedia.org /wiki/Neuron   (1899 words)

  
 Reference.com/Encyclopedia/Neuron
Neurons (also spelled neurones or called nerve cells) are the primary cells of the nervous system.
Neurons communicate with one another and to other cells through synapses, where the axon tip of one cell impinges upon a dendrite or soma of another, or less commonly to an axon.
Neurons of the cortex in mammals, such as the Purkinje cells, can have over 1000 dendrites each, enabling connections with tens of thousands of other cells.
www.reference.com /browse/wiki/Neuron   (828 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal
In the nervous system, efferent nerves – otherwise known as motor or effector neurons – carry nerve impulses away from the central nervous system to effectors such as muscles or glands (and also the ciliated cells of the inner ear).
The cell body of the efferent neuron is found in the central nervous system where it is connected to a single, long axon and several short dendrites projecting out of the cell body itself.
The motor neuron is present in the grey matter of the spinal cord and medulla oblongata, and forms an electrochemical pathway to the effector organ or muscle.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Efferent_nerve   (240 words)

  
 ScienceDaily: Motor neuron   (Site not responding. Last check: 2007-10-24)
In vertebrates, motor neurons (also called motoneurons) are efferent neurons that originate in the spinal cord and synapse with muscle fibers to facilitate muscle contraction and with muscle spindles to modify proprioceptive sensitivity.
Stem Cell Therapy Rescues Motor Neurons In ALS Model (August 6, 2007) -- In a study that demonstrates the promise of cell-based therapies for diseases that have proved intractable to modern medicine, scientists have shown it is possible to rescue the dying neurons...
Axon -- 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.
www.sciencedaily.com /encyclopedia/Motor_neuron   (1427 words)

  
 The Philosophy of Neuroscience
Neuronal output is the frequency of action potentials in the axon of the neuron in question.
The neuron's output state is transmitted as a signal strength to whatever neurons its axon synapses on.
Given that neurons' activity depends partly upon their total input, and total input depends partly on synaptic weights (e.g., presynaptic neurotransmitter release rate, number and efficacy of postsynaptic receptors, availability of enzymes in synaptic cleft), the capacity of biological networks to change their synaptic weights make them plastic vector-to-vector transformers.
plato.stanford.edu /entries/neuroscience   (11884 words)

  
 ScienceDaily: Sensory neuron   (Site not responding. Last check: 2007-10-24)
Sensory neurons are nerve cells within the nervous system responsible for converting external stimuli from the organism's environment into internal electrical impulses.
Movement Without Senses Coded Into Neurons, Says University Of Toronto Researcher (March 22, 2002) -- An animal's ability to move - like the kicking of a developing baby or the crawling and walking of insects - is intrinsic, not dependent on sensory stimulation, says a University of Toronto...
Damaged Motor Neurons In ALS Contribute To Their Own Death (April 24, 2007) -- Researchers have discovered that when motor neurons damaged by amyotrophic lateral sclerosis (ALS), or Lou Gehrig's disease, inappropriately send the wrong signal, immune cells react by killing the...
www.sciencedaily.com /encyclopedia/Sensory_neuron   (1412 words)

  
 Vocal Pathways Modulate Efferent Neurons to the Inner Ear and Lateral Line -- Weeg et al. 25 (25): 5967 -- Journal of ...
Three patterns of efferent activity were evident: A1, A2, excitation showed increased activity at fictive vocal onset; B1, B2, excitation/suppression showed increased activity at fictive vocal onset and decreased activity at fictive vocal offset; C1, C2, suppression/excitation showed suppression of activity during fictive vocalizations that was usually preceded by brief excitation.
the duration of the efferent response, the midshipman efferent
Roberts BL, Russell IJ (1972) The activity of lateral-line efferent neurons in stationary and swimming dogfish.
www.jneurosci.org /cgi/content/full/25/25/5967   (5384 words)

  
 notes4exam4
If there is only one efferent neuron, we must be talking about a somatic, not autonomic reflex, so the target organ must be a skeletal muscle.
Comment: A minimum complete parasympathetic reflex arc starts with a receptor and an afferent neuron, which synapses in the spinal cord (synapse #1) with the pre-ganglionic efferent neuron, which in turn synapses with the post-ganglionic efferent neuron (synapse #2).
Since preganglionic neurons in the sympathetic system are short, the ganglia would have to be near (proximal to) the spinal cord, which is where the preganglionic neuron originates.
www.msu.edu /~vaishnav/notes4exam4.html   (1831 words)

  
 Identification of dopaminergic neurons of nigral and ventral tegmental area subtypes in grafts of fetal ventral ...
Identification of dopaminergic neurons of nigral and ventral tegmental area subtypes in grafts of fetal ventral mesencephalon based on cell morphology, protein expression, and efferent projections.
You are here: Home → Selected Publications → Identification of dopaminergic neurons of nigral and ventral tegmental area subtypes in grafts of fetal ventral mesencephalon based on cell morphology, protein expression, and efferent projections.
Transplants of fetal ventral mesencephalic tissue are known to contain a mixture of two major dopamine (DA) neuron types: the A9 neurons of the substantia nigra pars compacta (SNpc) and the A10 neurons of the ventral tegmental area (VTA).
www.stemcellcenter.se /publications/Thompson2005   (337 words)

  
 Physiology of electrosensory lateral line lobe neurons in Gnathonemus petersii -- Sugawara et al. 202 (10): 1301 -- ...
neurons and interneurons were examined in an in vitro slice preparation.We focus here on the electrophysiological properties of the efferent neurons
It is probably mediated via the stellate neurons and the MG cells, which are themselves GABAergic interneurons intrinsic to the ELL
We suggest that MG cells exert an inhibitory bias on efferent neuron types
jeb.biologists.org /cgi/content/abstract/202/10/1301   (521 words)

  
 "The Neuron and its Organization," by Therial L. Bynum, M.D.
Above is a representation of a typical neuron, and some of its features.
In man, Neural Networks consist of two or more neurons with highly specialized non-neural sensory receptor cells, that are responsive to very specific environmental stimuli such as light, heat, osmolarity, stretching, and pressure.
The Afferent Axons of sensory neurons excite four interneurons, A, B, D, and E. Of these, B and D send impulses out of the system as Efferent Axons to excite other systems.
www.hypnosisforyou.com /neuron.html   (248 words)

  
 Untitled Document   (Site not responding. Last check: 2007-10-24)
Assume a hypothetical postsynaptic neuron has three presynaptic inputs—X, Y, and Z. When presynaptic neurons X and Y are stimulated simultaneously, the postsynaptic neuron reaches threshold and undergoes an action potential, yet when presynaptic neurons X and Z are stimulated simultaneously, there is no change in potential of the post- synaptic neuron.
Presynaptic neuron Y is excitatory, and presynaptic neuron Z is inhibitory.
PSPs occur at the dendrite of a motor neuron.
www.colorado.edu /kines/Class/IPHY3430-200/2007-exam1-answers.html   (3037 words)

  
 efferent - OneLook Dictionary Search
Efferent : Online Plain Text English Dictionary [home, info]
Efferent : Visionary, for the Study of Vision [home, info]
Phrases that include efferent: efferent nerve, efferent neuron, efferent ductules of testis, general visceral efferent column, vessel efferent, more...
www.onelook.com /?loc=rescb&w=efferent   (231 words)

  
 efferent - Definitions from Dictionary.com
an efferent part, as a nerve or blood vessel.
An efferent organ or body part, such as a blood vessel.
: conducting outward from a part or organ; specifically : conveying nervous impulses to an effector neurons> —compare
dictionary.reference.com /browse/efferent   (226 words)

  
 efferent neuron definition - Dictionary - MSN Encarta
efferent neuron definition - Dictionary - MSN Encarta
Search for "efferent neuron" in all of MSN Encarta
Small business becomes a big deal on campus
encarta.msn.com /dictionary_1861607595/efferent_neuron.html   (46 words)

  
 ScienceDaily: Health & Medicine Books
Amygdala -- The amygdala (Latin, corpus amygdaloideum) is an almond-shape set of neurons located deep in the brain's medial temporal lobe.
Shown to play a key role in the processsing of emotions, the amygdala...
Heart -- The heart is a hollow, muscular organ in vertebrates that pumps blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods.
www.sciencedaily.com /books   (1950 words)

  
 Transaction Friendly Scholars   (Site not responding. Last check: 2007-10-24)
"The subject of consciousness is not the body, brain or a neuron, but an "I", a person that may not be defined on the basis of the structure of his brain, but rather as a point of intersection in a net of social relations.
The "I" is not an entity in the same sense as a body, but a systemic relation.
Role of efferent influences on receptors in the formation of knowledge.
www.transactionalview.org /scholars/transFriendly.html   (7209 words)

  
 efferent neuron - Definition of efferent neuron by Webster's Online Dictionary   (Site not responding. Last check: 2007-10-24)
efferent neuron - Definition of efferent neuron by Webster's Online Dictionary
efferent neuron - a neuron conducting impulses outwards from the brain or spinal cord
motoneuron, motor nerve, motor nerve fiber, motor neuron, nerve cell, neuron
www.webster-dictionary.org /definition/efferent%20neuron   (46 words)

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