The effects of changes in extracellular calcium concentrations on the electrical properties of command neurons after acquisition of a defensive conditioned reflex in snails. 2006

D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
Biophysics Laboratory, Kazan Physicotechnical Institute, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russia.

Studies of the electrical characteristics of the command neurons of a defensive reflex showed that the membrane potential showed no significant changes in response to changes in the calcium concentration in the perfusing solution in either intact or trained snails. Increases in the calcium ion concentration in intact snails were accompanied by increases in the threshold potential, from 14 +/- 0.7 mV at 2.5 mM Ca2+ to 21.8 +/- 0.9 mV at 20 mM Ca2+. The threshold potential in trained snails decreased in response to both increases and decreases in calcium concentrations, from 16.8 +/- 0.6 mV (physiological saline containing 10 mM Ca2+) to 13.3 +/- 0.6 mV at 20 mM Ca2+ and 11.8 +/- 0.8 mV at 2.5 mM Ca2+. The critical depolarization level changed correspondingly: in intact snails, this decreased with increases in calcium concentration, while in trained snails it increased in response to both increases and decreases in the calcium concentration.

UI MeSH Term Description Entries
D008564 Membrane Potentials The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization). Resting Potentials,Transmembrane Potentials,Delta Psi,Resting Membrane Potential,Transmembrane Electrical Potential Difference,Transmembrane Potential Difference,Difference, Transmembrane Potential,Differences, Transmembrane Potential,Membrane Potential,Membrane Potential, Resting,Membrane Potentials, Resting,Potential Difference, Transmembrane,Potential Differences, Transmembrane,Potential, Membrane,Potential, Resting,Potential, Transmembrane,Potentials, Membrane,Potentials, Resting,Potentials, Transmembrane,Resting Membrane Potentials,Resting Potential,Transmembrane Potential,Transmembrane Potential Differences
D009474 Neurons The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM. Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D012018 Reflex An involuntary movement or exercise of function in a part, excited in response to a stimulus applied to the periphery and transmitted to the brain or spinal cord.
D002118 Calcium A basic element found in nearly all tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes. Coagulation Factor IV,Factor IV,Blood Coagulation Factor IV,Calcium-40,Calcium 40,Factor IV, Coagulation
D003213 Conditioning, Psychological Simple form of learning involving the formation, strengthening, or weakening of an association between a stimulus and a response. Conditioning, Psychology,Psychological Conditioning,Social Learning Theory,Social Learning Theories,Theory, Social Learning
D005110 Extracellular Space Interstitial space between cells, occupied by INTERSTITIAL FLUID as well as amorphous and fibrous substances. For organisms with a CELL WALL, the extracellular space includes everything outside of the CELL MEMBRANE including the PERIPLASM and the cell wall. Intercellular Space,Extracellular Spaces,Intercellular Spaces,Space, Extracellular,Space, Intercellular,Spaces, Extracellular,Spaces, Intercellular
D006372 Helix, Snails A genus of chiefly Eurasian and African land snails including the principal edible snails as well as several pests of cultivated plants. Helix (Snails),Snails Helix
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001362 Avoidance Learning A response to a cue that is instrumental in avoiding a noxious experience. Aversion Behavior,Aversion Learning,Aversive Behavior,Aversive Learning,Avoidance Behavior,Aversion Behaviors,Aversive Behaviors,Avoidance Behaviors,Behavior, Aversion,Behavior, Aversive,Behavior, Avoidance,Behaviors, Aversion,Behaviors, Aversive,Behaviors, Avoidance,Learning, Aversion,Learning, Aversive,Learning, Avoidance

Related Publications

D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
September 2004, Neuroscience and behavioral physiology,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 1996, Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 2000, Neuroscience and behavioral physiology,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 2003, Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 1997, Neuroscience and behavioral physiology,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 1998, Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 1978, Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
July 2003, Neuroscience and behavioral physiology,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 1979, Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
D I Silant'eva, and V V Andrianov, and T Kh Gainutdinova, and Kh L Gainutdinov, and I N Pleshchinskii
January 1980, Zhurnal vysshei nervnoi deiatelnosti imeni I P Pavlova,
Copied contents to your clipboard!