NEUROGLIAL CELLS Flashcards
What is a neuron?
a single cell
What is a nerve?
A group of neurons
What does the enodneurium wrap around
A single neuron
What does the perineurium do?
Holds bundles(fascicles) of neurons.
What are to different types of NERVES?
Sensory
Motor
Mixed
What determines the type the type of nerve?
The type of neurons that are in a nerve.
Mechano-receptors
mechanical forces
What are the type of mechano-receptors
Hair cells
Stretch receptors of muscles
Equilibrium receptors of ears
Receptors of skin (pain,touch, heat, cold)
CHEMO-receptors
Chemical sense solutes insolvents, taste, smell
OSMO-receptors
On the hypothalamus which monitors blood osmotic pressure
PHOTO-receptors
lighter eye,
eyespots
THERMO-receptors
Radiant (heat) energy
PHONO-receptors
sound waves
ELECTRO-receptors
detect electric currents in eels
Nocireceptors
pain receptors
Neuroglial cells
found in both PNS & CNS
Helper cells
Help our neurons
What are the jobs of astrocytes?
Maintains the blood- brain barrier
Forms & hold synapses
What near blood vessels?
Astrocytes
What else do astrocytes do?
Astrocytes completely cover the blood vessel, forming a to leave that blood siren & into the brain.
Sucks out certain nutrients from the blood & sending them to the neurons.
Microloglial cells
Phagocytes
What does microloglial do?
Moves around CNS & EAT UP THINGS THAT DON’T BELONG IN THE CNS.
Keeps CNS as clean as possible.
Epedymal cells
Found in the ventricle of the brain & spinal cord.
Moves cerebral spinal fluid.
What does cerebral spinal fluid do?
Provides nutrients to CNS
Oligodrocytes
Produces myelin, they make enough myelin to cover 60 neurons
They crawl up and down the neurons to see where myelin needs to be repaired.
Satellite cell
People don’t know what it does
Shwann cell
produces little myelin
wraps around the neuron like a cake roll.
When the adequate stimulus is added to an axon…
The amplitude of the action potential does not vary with the strength of the stimulus.
