Afferent and Efferent Synaptic Transmissions in Hair Cells

Physiology ◽  
1996 ◽  
Vol 11 (4) ◽  
pp. 161-166
Author(s):  
H Ohmori
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Synaptic Transmission ◽  
Nerve Terminal ◽  
Hair Cells ◽  
Electrical Signal ◽  
Membrane Hyperpolarization ◽  
K Channels ◽  
The Central Nervous System ◽  
Mechanical Information

Hair cells transduce mechanical information into electrical signal and, via afferent synapse, transmit it to the central nervous system (CNS). Hair cells receive cholinergic efferent innervation from the CNS, and a long-lasting membrane hyperpolarization is produced by activation of Ca2+-activated K+ channels. Acetylcholine may facilitate afferent synaptic transmission by suppressing K+ channels on the afferent nerve terminal.

scholarly journals Effect of Barbiturates on Synaptic Currents

1976 ◽  
Vol 4 (3) ◽  
pp. 199-202 ◽  
Author(s):  
T. A. Torda ◽  
P. W. Gage
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Neuromuscular Junction ◽  
Synaptic Transmission ◽  
Time Constant ◽  
Mode Of Action ◽  
Synaptic Currents ◽  
End Plate ◽  
The Central Nervous System ◽  
Central Synapses

Thiopentone and pentobarbitone reduce the time constant of decay of miniature end-plate currents when applied in anaesthetic concentrations to the neuromuscular junction. Such an effect at central synapses would lead to failure of synaptic transmission in the central nervous system and may reflect a common mode of action of many anaesthetic drugs.

Effect of Nicotine on the Synapse of the Central Nervous System

1958 ◽  
Vol 192 (3) ◽  
pp. 447-452 ◽  
Author(s):  
Sadayuki F. Takagi ◽  
Yutaka Oomura
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Nervous System ◽  
Synaptic Transmission ◽  
Reflex Activity ◽  
Synaptic Delay ◽  
Synaptic Potential ◽  
Before And After ◽  
The Central Nervous System ◽  
High Concentrations

The effect of nicotine on synaptic transmission in the frog and cat spinal cord was studied. Both a regular wick electrode and a microelectrode of the Ling-Gerard type were used. The reflex activity of the bullfrog spinal cord is facilitated by 0.01% nicotine solution, but is depressed and abolished by 0.1% solution. In the cat, intravenous administration of 150 mg/kg fails to block reflex activity, but topical application does block. The intracellular potential, of both frog and cat motoneurones, shows no change in the synaptic potential after application of the drug, but the spike appears after a shorter synaptic delay and one or more additional spikes appear. When the synaptic delay becomes sufficiently short, however, all spikes suddenly disappear, leaving the still unchanged synaptic potential. Occasionally the synaptic delay is again increased just before the spike potentials disappear. The excitability of a frog motoneurone was measured, by a recording microelectrode, before and after nicotine application. The drug first increased and then decreases excitability. Epinephrine can restore a reflex discharge depressed or abolished by nicotine. It is concluded that high concentrations of nicotine block synaptic transmission in the central nervous system, acting on the cell body but not on the synaptic potential.

Translational control of synaptic plasticity

2010 ◽  
Vol 38 (6) ◽  
pp. 1527-1530 ◽  
Author(s):  
Joel D. Richter
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Synaptic Plasticity ◽  
Synaptic Transmission ◽  
Learning And Memory ◽  
Translational Control ◽  
Synaptic Strength ◽  
Memory Formation ◽  
The Central Nervous System ◽  
Flow Of Information

Synapses, points of contact between axons and dendrites, are conduits for the flow of information in the circuitry of the central nervous system. The strength of synaptic transmission reflects the interconnectedness of the axons and dendrites at synapses; synaptic strength in turn is modified by the frequency with which the synapses are stimulated. This modulation of synaptic strength, or synaptic plasticity, probably forms the cellular basis for learning and memory. RNA metabolism, particularly translational control at or near the synapse, is one process that controls long-lasting synaptic plasticity and, by extension, memory formation and consolidation. In the present paper, I review some salient features of translational control of synaptic plasticity.

scholarly journals The Effects of General Anesthetics on Synaptic Transmission

2020 ◽  
Vol 18 (10) ◽  
pp. 936-965
Author(s):  
Xuechao Hao ◽  
Mengchan Ou ◽  
Donghang Zhang ◽  
Wenling Zhao ◽  
Yaoxin Yang ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Ion Channels ◽  
Side Effects ◽  
Synaptic Transmission ◽  
Molecular Targets ◽  
Synaptic Function ◽  
General Anesthetics ◽  
Voltage Gated ◽  
The Central Nervous System

General anesthetics are a class of drugs that target the central nervous system and are widely used for various medical procedures. General anesthetics produce many behavioral changes required for clinical intervention, including amnesia, hypnosis, analgesia, and immobility; while they may also induce side effects like respiration and cardiovascular depressions. Understanding the mechanism of general anesthesia is essential for the development of selective general anesthetics which can preserve wanted pharmacological actions and exclude the side effects and underlying neural toxicities. However, the exact mechanism of how general anesthetics work is still elusive. Various molecular targets have been identified as specific targets for general anesthetics. Among these molecular targets, ion channels are the most principal category, including ligand-gated ionotropic receptors like γ-aminobutyric acid, glutamate and acetylcholine receptors, voltage-gated ion channels like voltage-gated sodium channel, calcium channel and potassium channels, and some second massager coupled channels. For neural functions of the central nervous system, synaptic transmission is the main procedure for which information is transmitted between neurons through brain regions, and intact synaptic function is fundamentally important for almost all the nervous functions, including consciousness, memory, and cognition. Therefore, it is important to understand the effects of general anesthetics on synaptic transmission via modulations of specific ion channels and relevant molecular targets, which can lead to the development of safer general anesthetics with selective actions. The present review will summarize the effects of various general anesthetics on synaptic transmissions and plasticity.

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