Human Anatomy - Outline 3 - Neurons

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Bipolar neuron

2 fibers- 1 axon, 1 dendrite
found in PNS
found in eyes, ears, & nasal cavity

Unipolar neuron

Single fiber - part is dendrite, part is axon
found in PNS
found throughout body

Multipolar neurons

Many fibers - many dendrites, single axon
found in CNS & PNS
most abundant neuron type

Sensory neurons (afferent)

carry impulses from receptors out in the body to the CNS.
Some are bipolar neurons, most are unipolar neurons
PNS neurons

Interneurons

Neurons of CNS
Process & integrate impulses
all are multipolar neurons

Motor neurons

efferent neurons
carry impulses from CNS out to effectors
PNS
All multipolar neurons

somatic motor neurons

carry impulses out to voluntary effectors (skeletal muscle)

visceral motor neurons

carry impulses to involuntary effectors (smooth & cardiac muscle glands)

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