Neuron Labeling (p231)
e
nucleus
Ganglia
collections of neuron cell bodies that are outside of the CNS
How many axons does a multipolar neuron have?
one
Non-cilliated ependymal cells serve what function?
secrete CSF
a
presynaptic terminals
Spinal Nerves
PNS nerves originating from the spinal cord
Saltatory vs Continuous conduction, how are they different? Who is faster?
Saltatory faster, skips from node to node
Depolarization-what is happening to the sodium and potassium ions?
sodium diffusing in, nothing is happening to potassium
g
dendrites
Efferent neurons
neurons that transmit action potentials from CNS to the effector organs
2 reasons why the stimulus on a neuron doesn't result in an action potential
1. absolute refractory period
2. subthreshold stimulus
High K+ outside the axon and high Na+ inside the axon
Is the potential difference positive or negative? What has occured?
Negative, repolarization
b
Node of Ranvier
Somatic motor nervous system
neurons that transmit action potentials from the CNS to skeletal muscles
What 3 conditions must be met to regenerate a severed axon?
1. Must be covered with Schwann cells
2. Cell body must still be alive
3. reasonably alligned
After ap has passed, what brings the ions back to resting conditions?
sodium/potassium pump
j
Axon Hillock
Association neuron
conducts neural signals from one neuron to another neuron within the CNS
A signal originates in one receptor and ends up stimulating action potentials in many different places in the CNS and PNS. What type of neuron arrangement is this called?
Divergent Circuit
Compare the max potential differences of the APs of a warm sensation vs a burning sensation (think how dramatically the chart goes up). What is changing?
AP same, frequency is increased