Structure And Function Of Cell Of The Nervous System Flashcards
Cells that process info
Neuron
Nervous system cells
Neurons
Glia
Cells that provide support, structure and nourishment
Glia
3 types of neuron cells
Sensory neuron
Interneuron
Motor neuron
Cells located within CNS that form circuits between other neurons
Interneuron
3 main types of glial cells
Astrocytes (star CNS)
Microglia (clean uppers/PAC man CNS)
Oligodendrocytes (forms myelin sheaths CNS)
*schwann cells- only in PNS wraps around itself
Fatty tissue that holds neurons in place
Astrocyte
Smallest of the glial cells, act as phagocytes
Microglia
Forms myelin sheaths
Oligodendrocytes
Electrical communications are
Within neurons
Chemical communications are
Between neurons
Movement of ions
Electrical potentials
Na+ channels open
EPSPs
Cl- channels open
IPSPs
Summation of synaptic potentials
Action potentials
Reduction of the membrane potential of a cell from it’s normal resting potential (toward zero)
Depolarization
Membrane potential that results in depolarization
Excitatory
Increase in the membrane potential of a cell relative to normal resting potential
Hyperpolarization
All or none law
Once an action potential is triggered in axon it is propagated to the end of the nerve fiber (axon)
How is an action potential conveyed across a myelinated axon?
It travels much faster
Saltatory Conduction
Conduction of action potentials by myelinated axons
