neuroglia

neuroglia

cells that function is to support neurons

• maintain ECM

• protection

• able to divide

astrocytes

CNS

largest and most numerous

anchor neurons and blood vessels

form blood brain barrier

repair damage brain tissue

Oligodendrocytes

myelinate certain CNS axons in the CNS

microglia

CNS

activated by injury

removes cells and debris by phagocytosis

stimulate inflammation

ependymal cells

CNS

line cavities

circulated cerebrospinal fluid

produces cebrospinal fluid

neurolemmocytes

PNS

repair damaged axons

aka Schwann cells(protective myelin sheath)

repair damaged axons

satellite cells

poorly understood

supports cell bodies

links to other cells

maintain ECM

myelinated axons

conducts action potentials 12-150x faster than axons w/o

membrane potential

electrical gradient across the plasma membrane, resting is -70mV and polarized

“all or nothing”

local potentials

only travel short distances potential

reversible

neurons

• excitable cells that send/receive signals in the form of action potential

• directly responsible for nervous tissue function

• generally amitotic

ventricles

continuous cavities within the brain and spinal cord

• lines with ependymal cells

• filled with cerebrospinal fluid

cerebrospinal fluid

cushions and insulated the brain

removes waste from the brain re