Neuronal Dynamics (Gerstner)

https://neuronaldynamics.epfl.ch/online/Ch1.S1.html

9 flashcards · Biology · by lakesare

1. What's she holding?

   One of the Cajal's reproductions! This reproduction of a drawing of Ramón y Cajal

2. What's presynaptic VS postsynaptic cell?

   presynaptic cell - sending neuron postsynaptic cell - receiving neuron It is common to refer to the sending neuron as the presynaptic cell and to the receiving neuron as the postsynaptic cell.A single neuron in vertebrate cortex often connects to more than 104 postsynaptic neurons.The site where the axon of a presynaptic neuron makes contact with the dendrite (or soma) of a postsynaptic cell is the synapse.

3. What's a synaptic cleft?

   A synaptic cleft is a space that separates two neurons. A synaptic cleft forms a junction between two or more neurons and helps nerve impulse pass from one neuron to the other

4. How does the signal transmission happen in the synapse?

   Action potential in the presynaptic cell triggers a release of a neurotransmitter. When an action potential arrives at a synapse, it triggers a complex chain of bio-chemical processing steps that lead to a release of neurotransmitter from the presynaptic terminal into the synaptic cleft.Postsynaptic cell detects neurotransmitters and opens ion channels, letting the extracellular fluid into the cell (which changes cell's potential). As soon as transmitter molecules have reached the postsynaptic…

5. What does the excitatory VS inhibitory synapse do to the u(t)? u(t) - is a membrane potential (the potential difference between the interior of the cell and its surroundings).

   excitatory synapse - raises u(t) inhibitory synapse - lowers u(t)

6. What does PSP stand for?

   PSP - postsynaptic potential. EPSP - excitatory PSP.IPSP - inhibitory PSP.

7. What's a spike train?

   A chain of action potentials emitted by a single neuron. A chain of action potentials emitted by a single neuron is called a spike train – a sequence of stereotyped events which occur at regular or irregular intervals.

8. Action potential VS membrane potential?

   An action potential is a rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane with a characteristic pattern.

9. What's a postsynaptic potential?

   A change after the cell receives neurotransmitters. εij(t) - postsynaptic potential at cell i (due to cell j)ui(t) - membrane potential at cell iurest - -70mV Postsynaptic potentials are graded potentials, and should not be confused with action potentials although their function is to initiate or inhibit action potentials. They are caused by the presynaptic neuron releasing neurotransmitters from the terminal bouton at the end of an axon into the synaptic cleft.