Ch 12
Supporting cells in the nervous system
Neuroglia
This neuron has only 1 process
Unipolar
This neuron has 1 main dendrite and 1 axon
Bipolar
This neuron has several dendrites and 1 axon
Multipolar
This neuron is shaped like a pyramid
Pyramidal cell
Name for a collection of axons in the brain and spinal cord
Tract
Name for a collection of axons in the PNS
Nerve
These neurons connect sensory and motor neurons
Interneurons
These neurons send info to the CNS
Sensory/Afferent
These neurons send nerve impulses to muscles & glands
Motor/Efferent
Name for a cluster of cell bodies of neurons
Nuclei
Name for a cluster of cell bodies of neurons in the PNS
Ganglia
This color matter contains unmyelinated axons, cell bodies, and neuroglia
A small electrical charge used for short distance communication and triggering an action potential
Graded Potential
A larger electrical charge for short or long distance communication that is triggered by a graded potential
Action Potential
The trigger zone in an axon is located at the?
Axon Hillock
Name of the autoimmune disorder that destroys myelin sheaths in the CNS
Multiple Sclerosis
Name for the brain's ability to sprout new dendrites, synthesize new proteins, and change synaptic contacts with other neurons
Plasticity
Baseline charge of cell membrane
Resting Membrane Potential
This segment of the neuron contains the synaptic end bulb that releases NT
Transmissive Segment
What chapter are we on?
Ch 12
Occurs when voltage-gated K+ channels stay open longer than the time needed to reach resting membrane potential; during this time the membrane potential is less than the RMP of -70 mV
Hyperpolarization
Occurs when the threshold (-55 mV) is reached, Na+ channels open and Na+ enters rapidly, reversing polarity from negative to positive (-55 mV to +30 mV)
Depolarization
Type of summation where there same signal/neuron causes GPs repeatedly over time
Temporal Summation
Type of summation where multiple signals/neurons cause multiple GPs
Spatial Summation