arise from axon hillock

contain no nissl substance

carry info away from the cell

carries information toward the cell

increases surface area with branching

unipolar only has axon

bipolar has one axon one dendrite

multipolar has one axon multiple dendrites

small cell, round nucleus, little cytoplasm

more numerous

play a role in myelination, can myelinate more than one nerve fiber in the CNS

contribute to blood brain barrier

provide structural support

assist in scarring (take place of fibroblasts)

ciliated

line ventricles and central canal

transport cerebral spinal fluid via cilia

modified cells in choroid plexus produce CSF

dish rag cells

small and fusiform

clean up, injury repair

phagocytosis

myelination of peripheral nerves

only myelinate one axon but can be associated with multiple unmyelinated

plasmalemma: surrounds nerve fibers that are not myelinated

outer gray matter, inner white matter

control motor function

white matter covered by a thin layer of gray

motor control

electrotonic: ephapses electrical synapses

electrochemical: synapses, neurotransmitter