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Related Concept Videos

Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Postsynaptic Potential (PSP)01:32

Postsynaptic Potential (PSP)

Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...

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Combining Imaging and Electrophysiology to Visualize and Record Spreading Depolarizations in Mice
07:06

Combining Imaging and Electrophysiology to Visualize and Record Spreading Depolarizations in Mice

Published on: October 4, 2024

Neurovascular coupling during spreading depolarizations.

Ulrike Hoffmann1, Cenk Ayata

  • 1Klinik für Anaesthesiologie Technische, Universität MünchenKlinikum rechts der Isar, München, Germany.

Acta Neurochirurgica. Supplement
|August 15, 2012
PubMed
Summary
This summary is machine-generated.

Injury depolarizations worsen brain injury by causing vasoconstriction and reducing blood flow, unlike in normal brain tissue. Understanding these neurovascular changes is key to improving outcomes in stroke and trauma.

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Pathophysiology

Background:

  • Injury depolarizations, similar to spreading depression, contribute to tissue damage in neurological injuries.
  • Research has primarily focused on the origins and metabolic effects of these depolarizations.
  • Recent findings indicate injury depolarizations cause detrimental vasoconstriction, contrasting with vasodilation in normal brain states.

Purpose of the Study:

  • To investigate the shift in hemodynamic response from vasodilation to vasoconstriction during injury depolarizations.
  • To explore the underlying mechanisms driving this adverse vascular effect in brain injury.
  • To provide a framework for understanding neurovascular coupling in the context of brain trauma and stroke.

Main Methods:

  • Review of recent physiological and pharmacological studies.
  • Analysis of data from normal and injured brain tissue across different species.
  • Examination of factors influencing vasomotor responses during intense pandepolarization.

Main Results:

  • Injury depolarizations induce vasoconstriction, diminishing cerebral perfusion.
  • This vasoconstrictive effect exacerbates metabolic supply-demand mismatch, worsening tissue damage.
  • Potential contributing factors include elevated extracellular K(+) and reduced perfusion pressure.

Conclusions:

  • The hemodynamic response to injury depolarizations is complex, involving opposing vasomotor mechanisms.
  • Understanding these mechanisms is crucial for developing therapeutic strategies for ischemic stroke, hemorrhage, and trauma.
  • Further research is needed to fully elucidate the neurovascular coupling in brain injury.