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Topic: Saltatory conduction


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In the News (Wed 26 Jun 19)

  
  Saltatory conduction -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-22)
Saltatory conduction is a means by which (The local voltage change across the cell wall as a nerve impulse is transmitted) action potentials are transmitted along (A white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers) myelinated (A threadlike extension of a nerve cell) nerve fibers.
Thus in myelinated axons, action potentials do not propagate as waves, but recur at successive nodes and in effect hop along the axon, by which process they travel faster than they would otherwise.
sal.ta.to.ry \'sal-t*-.to-r-e-, 'so.l-, -.to.r-\ aj 1: of or relating to
www.absoluteastronomy.com /encyclopedia/s/sa/saltatory_conduction.htm   (113 words)

  
 Dorlands Medical Dictionary   (Site not responding. Last check: 2007-10-22)
antidromic conduction,   the conduction of a nerve impulse in a direction contrary to the normal direction, as occurs in experimental conduction studies.
decremental conduction,   the delay or failure of propagation of an impulse in the atrioventricular node resulting from progressive decrease in the rate of the rise and amplitude of the action potential as it spreads through the node.
saltatory conduction,   the rapid passage of a potential from node (of Ranvier) to node of a myelinated nerve fiber, rather than along the full length of the membrane.
merckmedicus.com /ppdocs/us/common/dorlands/dorland/dmd-c-053.htm   (2297 words)

  
 Action potential - Open Encyclopedia   (Site not responding. Last check: 2007-10-22)
This mode of propagation is known as saltatory conduction.
The disease multiple sclerosis (MS) is due to a breakdown of myelin sheathing, and degrades muscle control by destroying axons' ability to conduct action potentials.
The duration of the hyperpolarization determines a nerve's refractory period (how long until it may conduct another action potential) and hence the frequency at which it will fire under continuous stimulation.
open-encyclopedia.com /Action_potential   (1147 words)

  
 Saltatory conduction - Wikipedia, the free encyclopedia
Saltatory conduction is a means by which action potentials are transmitted along myelinated nerve fibers.
Because the salty cytoplasm of the axon is electrically conductive, and because the myelin inhibits charge leakage through the membrane, depolarization at one node of Ranvier is sufficient to elevate the voltage at a neighboring node to the threshold for action potential initiation.
This process is outlined as the charge will passively spread to the next node of Ranvier to depolarize it to threshold which will then trigger an action potential in this region which will then passively spread to the next node and so on.
en.wikipedia.org /wiki/Saltatory_conduction   (185 words)

  
 [No title]   (Site not responding. Last check: 2007-10-22)
Saltatory conduction, from saltare meaning to jump, means jumping conduction.
Saltatory conduction achieves a considerable increase in conduction velocity, of the action potential, for a small increase in diameter.
Saltatory conduction is also very energy efficient, as only a small part of the axon is involved in the exchange of ions, much fewer ions need to be pumped back after the action potential has passed.
www.students.stir.ac.uk /biology/actpot/saltat.htm   (221 words)

  
 Biology | Multiple Choice Quiz
Saltatory conduction is the influx of sodium ions during neuron impulse conduction.
Saltatory conduction is transmission of nerve impulses along myelinated fibers.
Saltatory conduction is the transmission of nerve impulses to the endocrine glands.
highered.mcgraw-hill.com /sites/0073031208/student_view0/chapter54/multiple_choice.html   (918 words)

  
 Untitled Document
For example, the difference in speed between small, unmyelinated nerves and larger, myelinated ones can be as much as that between a few millimeters per second and 200 meters per second (33, p.634).
Therefore, myelin is essential for efficient conduction of the impulse (33, 34).
A further important consideration is that such a swift rate of conduction allows the axon to have a reduced diameter, giving it the basic electrical properties of a conducting "wire." This, in turn, allows for the construction of a larger and more complex nervous system.
www.brown.edu /Courses/BI0032/stemcell/demye0.htm   (449 words)

  
 Kids.net.au - Encyclopedia Saltatory conduction -   (Site not responding. Last check: 2007-10-22)
Saltatory conduction is a means by which action potentials are transmitted along myelinated fibers of neurons.
Because the salty cytoplasm of the axon is electrically conductive, and because the myelin inhibits charge leakage through the membrane, depolarization at one node is sufficient to elevate the voltage at a neighboring node to the threshold for action potential initiation.
Thus in myelinated axons, action potentials do not propagate as waves, but recur at successive nodes and in effect hop along the axon faster than they would travel otherwise.
www.kids.net.au /encyclopedia-wiki/sa/Saltatory_conduction   (127 words)

  
 3 Examples Of Conduction on Almondnet   (Site not responding. Last check: 2007-10-22)
Conduction is the transfer of heat or electric current from one substance to another by direct contact.
Conduction is when the heat moves through an object or from one object to another because the two objects...
The transfer of heat by conduction is caused by...
www.focusrecordingstudio.co.uk /records/3_examples_of_conduction.html   (376 words)

  
 lecture 9: Nervous system
insulation - saltatory conduction allows a much smaller diameter, and also the increase in conduction rate is now proportional to diameter, probably because it is proportional to the distance between nodes.
Conduction is via a chemical neurotransmitter released from one cell and received by the next.
In this synapse the conduction is in one direction only, from the boutons of axon terminal to the dendrite or cell body of the next cell.
nas.cl.uh.edu /novotny/aph9.htm   (1431 words)

  
 Myelination
It does so via the phenomenon of saltatory conduction, where the nerve impulse actually jumps (saltus is Latin for jump) from Schwann cell to Schwann cell.
It was not until Helmholtz measured nerve conduction for the first time in the mid 1800s that it was realized that nerve conduction is actually quite slow, much slower than sound, for instance.
For example, the fastest rates of conduction would be equivalent to a runner running the 100 meter dash in just under a second.
peace.saumag.edu /faculty/Kardas/Courses/GPWeiten/C3BioBases/Myelination.html   (404 words)

  
 Question 19   (Site not responding. Last check: 2007-10-22)
In a myelinated nerve, the impulse leaps from node to node - this is called saltatory conduction.
When the nerve is myelinated, this conduction is more rapid and energy efficient than in an unmyelinated nerve.
And the greater the diameter of the axon, the thicker is the myelin sheath, therefore saltatory conduction occurs more rapidly in thicker axons.
www.pc.maricopa.edu /dental/LocalAnesthesia/Preview/Anatomy/16-20/q19y.htm   (58 words)

  
 Nerve impulse Article, Nerveimpulse Information   (Site not responding. Last check: 2007-10-22)
Because the salty cytoplasm of the axon is electrically conductive, andbecause the myelin inhibits charge leakage through the membrane,depolarization at one node is sufficient to elevate the voltage at a neighboring node to the threshold for action potentialinitiation.
The disease multiple sclerosis (MS) is due to a breakdown ofmyelin sheathing, and degrades muscle control by destroying axons' ability to conduct action potentials.
The duration of the hyperpolarization determines a nerve's refractory period (how long until it may conduct another actionpotential) and hence the frequency at which it will fire under continuousstimulation.
www.anoca.org /action/potential/nerve_impulse.html   (881 words)

  
 Encyclopedia: Saltatory conduction
A. Schematic of an electrophysiological recording of an action potential showing the various phases which occur as the wave passes a point on a cell membrane.
In neuroscience, myelin is an electrically insulating fatty layer that surrounds the axons of many neurons, especially those in the peripheral nervous system.
An axon, or nerve fiber, is a long slender projection of a nerve cell, or neuron, which conducts electrical impulses away from the neurons cell body or soma.
www.nationmaster.com /encyclopedia/Saltatory-conduction   (354 words)

  
 Saltatory Conduction of APs   (Site not responding. Last check: 2007-10-22)
This is the type of conduction of action potentials that I described during our class this week.
This manner of conduction is a lot faster because only the nodes of Ranvier are involved in action potential conduction.
So, saltatory conduction is when the action potential jumps down the axon from node to node.
distance.stcc.edu /AandP/AP/AP1pages/nervssys/unit11/saltator.htm   (587 words)

  
 Department of Physiology | Teaching | PHY 2011   (Site not responding. Last check: 2007-10-22)
B. decreases in rate as it is conducted along the axon.
The conduction velocity of a nerve fibre is:
E. Action Potentials are always conducted by saltatory conduction except in the neurons with the smallest diameters.
med.monash.edu.au /physiology/teaching/phy2011/Revision/lecture8.htm   (636 words)

  
  Matter has 2 a priori properties. It has MASS and it has ELECTRICAL CHARGE. We are going to spend some time talking ...
The conducting region of the neurons is the axon.
Channels in the conducting region have gates that are operated by voltage changes occurring in nearby areas of the cell.
Conduction velocity of large diameter, myelinated axons can be as fast as 120 m/s, or in small diameter, unmyelinated axons, as slow as 0.5 m/s.
fog.ccsf.cc.ca.us /~rmeckler/mempot2.htm   (8692 words)

  
 Saltatory conduction   (Site not responding. Last check: 2007-10-22)
Saltatory conduction is a means by which actionpotentials are transmitted along myelinated nervefibers.
Because the salty cytoplasm of the axon is electrically conductive, andbecause the myelin inhibits charge leakage through the membrane,depolarization at one node of Ranvier is sufficient to elevate thevoltage at a neighboring node to the threshold for action potential initiation.
Thus in myelinated axons, action potentials donot propagate as waves, but recur at successive nodes and in effect hop along the axon, by which process they travel faster thanthey would otherwise.
www.therfcc.org /saltatory-conduction-87015.html   (101 words)

  
 Anatomy Chapter 9 Nervous Tissue   (Site not responding. Last check: 2007-10-22)
The ____ conducts nerve impulses from the neuron to the dendrites, the cell body of another neuron or an effector organ of the body such as a muscle or a gland.
Impulse conduction in fibers without myelin is called ___________ conduction.
At a chemical synapse, there is only ____ ____ nerve impulse conduction to a postsynaptic dendrite, cell body or axon hillock.
watson2.arsc.k12.ar.us /wchs/potillo/tests/anatomy_chapter_9_notes_test.htm   (791 words)

  
 16 Action Potential   (Site not responding. Last check: 2007-10-22)
By the time the channels are in an excitable state, the action potential has moved far enough down the length of the axon that the graded potentials that spread electrotonically are of insufficient strength to elicit an upstream potential.
Thus, conduction of the AP is effectively unidirectional.
This kind "leaping" from node to node is called saltatory conduction (saltare is Latin for dancing), and can increase the rate of propagation by 50-fold.
human.physiol.arizona.edu /sched/cv/wright/16action.htm   (1894 words)

  
 Neurons II questions   (Site not responding. Last check: 2007-10-22)
For the AP to get from node to node, it must move via saltatory transport (there is no other way).
Propagation of AP's along unmyelinated axons is continuous, not saltatory as in myelinated membranes.
Propagation of the action potential in myelinated neurons is called "saltatory" (which means "jumping") since the action potential jumps from node to node (node refers to the nodes of Ranvier).
grapevine.abe.msstate.edu /classes/abe4323/2002/abe4323cd/11/neurons_II_ques.html   (2129 words)

  
 Fenestration nodes and the wide submyelinic space form the basis for the unusually fast impulse conduction of shrimp ...
Fenetration in the myelin sheath of nerve fibers of the shrimp: A novel node of excitation for saltatory conduction.
Ionic currents of the nodal membrane underlying the fastest saltatory conduction in myelinated giant nerve fibers of the shrimp Penaeus japonicus.
Saltatory conduction and a novel type of excitable fenestra in shrimp myelinated nerve fibers.
jeb.biologists.org /cgi/content/refs/202/15/1979   (420 words)

  
 CIDP Syndrome Support Group - CIDP
The myelin sheath is a fatty covering acting as an (insulator which helps conduction) to the fibers of nerves.
See a example of salutatory conduction shockwave needed.
See a video of conduction in a nerve.
www.cidpusa.org /details.html   (1483 words)

  
 The physiological effect of anti-GM1 antibodies on saltatory conduction and transmembrane currents in single motor ...
The physiological effect of anti-GM1 antibodies on saltatory conduction and transmembrane currents in single motor axons -- Hirota et al.
The physiological effect of anti-GM1 antibodies on saltatory conduction and transmembrane currents in single motor axons
Conduction block was found in 82% of the fibres treated with anti-GalC sera
brain.oxfordjournals.org /cgi/content/abstract/120/12/2159   (510 words)

  
 SSB HISTOLOGY Nervous Tissue SAQ
A narrower hose has lower conductance, equivalent to higher resistance (resistance is the mathematical reciprocal of conductance).
That is, for a hose with water flowing from high pressure toward low, pressure within the hose will drop along the length of the hose, with sharper drops at narrow points, just like voltage dropping across a resistor in an electric circuit.
If a local pressure change is imposed on such a hose, the effects will spread as a function time in a way that depends on diameter (i.e., electrical conductance along the axoplasm), leakiness (conductance across the axonal membrane), and elasticity (capacitance of the axonal membrane).
www.siumed.edu /~dking2/ssb/saltcon.htm   (802 words)

  
 THE BRAIN FROM TOP TO BOTTOM
In contrast, the saltatory conduction that takes place in myelinated axons allows a potential to travel at speeds of up to 120 metres per second (over 400 km/h)!
The reason that the myelin sheath speeds up neural conduction is that the action potentials literally jump from one node of Ranvier to the next.
This process is called saltatory conduction (from the Latin saltare, meaning “to jump”), as opposed to the much slower, continuous propagation that occurs in non-myelinated axons.
www.thebrain.mcgill.ca /flash/i/i_01/i_01_cl/i_01_cl_fon/i_01_cl_fon.html   (457 words)

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