A&P Test 2 Flashcards
What are the different ways to classify a neuron?
Size
Myelenation states
What is a A neuron?
a heavily myelinated neuron
What is a B neuron?
a lightly myelinated neuron
What is a C neuron?
a non-myelinated neuron
What is the biggest size a neuron diameter can be?
20 mm
What is the smallest size a neuron diameter can be?
0.5mm
Important information is usually sent through
a bigger, myelinated neuron
Motor functions are sent through
bigger, myelinated neurons
Less important information is usually sent through
smaller, less myelinated neurons
What are examples of the less important information that is sent via neurons?
Tickle
Cold
Warmth
Myelinated (A fibers) are subdivded into what categories?
Alpha
Beta
Gama
Delta
What is the largest subcategory of an A neuron?
alpha
Rank the A neuron subunits from smallest to largest
Delta<Gama<Beta<Alpha
All neurons have a
Cell body
What is another name for the cell body in a neuron?
Soma
What are the projections from the cell body called?
Dendrites
Can dendrites connect to the cell body?
Yes
Excitatory connections on the dendrites create a more ______ membrane potential
postive
Inhibitory connections on the dendrites create a more ______ membrane potential
negative
What is the projection from the soma that an action potential moves down called?
Axon
Is the axon hillock more negative or more positive?
more Negative
Most axons are
myelinated
What is a presynaptic terminal?
The very end of an axon before it connects to a target
What are the “brakes” in the nervous system?
Axon hillocks and Chloride