Neuron
What is a neuron?
A cell that conducts impulses
*how information flows
What are Motor Neurons (Efferent Neurons)?
Conducts nervous impulses away from the CNS
What is an Astrocyte?
In the CNS
Star-shaped, structural support, and physiological support
What is a Schwan Cell?
In the PNS
Myelinate axons in the PNS (wrap around)
Cell body is involved
What do Brain tumors usually form from?
Neuroglia
What are the parts of a neuron?
Cell Body, Dendrites, Axon, Axon Hillock, Axon Terminal, and Synaptic Endbulb
What is Bipolar on an axon?
2 projections
What are Microglia?
In the CNS
Small, phagocytic (engulf pathogens, debris, function like a white blood cell)
What is myelination?
They function to speed nervous impulses
*Slower without it
What is White Matter?
In the CNS
Pale, light
What do dendrites do?
They are branched
Receive information
What is multipolar?
A lot of branches from the cell body
What is an Oligodendrocyte?
In the CNS
Produce myeline, wrap around axons
Myelinate axons in the CNS
What cells myelinate axons?
Schwan cells and Oligodendrocytes
What is Gray Matter?
In the CNS
Darker, gray
What are Sensory Neurons (Afferent Neurons)?
They conduct nervous impulses towards the CNS
What is Unipolar?
One projection
* Most sensory neurons are unipolar
What is an Ependymal Cell?
In the CNS
Long Cilia lines cavities
Cuboidal or columnar in a single layer
Produce/circulate CSF
What is required to repair axons in the CNS?
Neurolemma
What is a nerve?
In PNS
White Matter
bundles of axons
What are Interneurons (Association Neurons)?
They are inside the CNS
What are Neuroglia?
Helper cells for neurons
Supporting cells, actively divide so they undergo mitosis
What is the Cilia's function in an Ependymal cell?
Face Cavity
Move/circulate CSF
Why can CNS neurons not repair themselves?
They have oligodendrocytes instead of schwan cells so they don't have a neurolemma
In the CNS
White matter
Bundle of axons