INTRO TO CNS Flashcards
What gyri does the limbic lobe consist of
cingulate gyrus and the parahippocampal gyrus
CSF is produced by…
ependymal cells of the choroid plexus
What connects the 3rd and 4th ventricle
the cerebral aqueduct
Between K+ and Na+ which is higher in extracellular space? intracellular space?
Na+
K+
What is equilibrium potential
the membrane potential where concentration gradient = electrical gradient
How do voltage-gated channels open?? where on the neuron are they found?
A chance in intracellular charge opens the channels
Found in the axon and axon terminals
How do ligand-gated channels open?? where on the neuron are they found?
A molecule binds to a specific site on the channel causing it to open
They are mainly found in dendrites
What are leaky channels? where are they found?
A channel that facilitates passive diffusion of a specific ion/molecule
found throughout the axon
What is spatial summation
receives stimuli from multiple neurons close together in the same timeframe
What is temporal summation
Receives repeated stimuli from on neuron in a small timefram (another stimuli is received before the initial one fades)
what threshold does a neuron need to surpass is order to send an AP
-55mV
Via what two mechanisms do APs travel towards the axon terminal
Active current
passive current
What is active current
Voltage gated sodium channels allow the influx of sodium into the cell, leading to depolarization and the generation of an action potential
What is passive current
positive charge inside the axon will move laterally down the axon as it is attracted to the adjacent negative charge. The movement of charge will then cause downstream voltage-gated sodium channels to open resulting in the generation of another action potential
What is capacitance
the ability to store electrical charge between two conducting plates
