Supporting cells & nerves

responsabile for insulating neurons & preventing signal interference

• glial cells smaller than neurons
• more numerous (in brain)
• has mitotic ability

• cells that are star shaped
• control ionic environment (prevents impulse interference)
• recapture & recycle neurotransmitters

cells that are small, least abundant, act as phagocytes

cells that help to circulate cerebrospinal fluid

produce myelin sheaths of CNS neurons

astrocytes, microglia, epedymal

surround cell bodies in ganglion

wrap around axons creating myelin sheath assisting in speeding up rate at which impulse travels

satellite cells & schwann cells

form insulating layer preventing leakage of electrical current

nucleus & cytopaslm together are called neurilemma

bundles of axons (nerve fibers) that are myelinated or unmyelinated

move signals fast

move signals slowly

groups of nerves bundling into nerve fascicles surrounded by perineurium with whole nerve surrounded by epineurium

involuntary unlearned actions stimulating somatic muscles or viscera to react quickly in response to a stimulus

simple response with no interneuron synapse between motor & sensory neurons

one or multiple interneuron synapses

SR - monosynaptic

WR - polysynaptic