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Monahan: Nerve Cells
Types of Neurons and Neuroglia
Vocabulary | Definition |
---|---|
neuron | a nerve cell that carries an impulse |
neuroglia | nerve cells that do not carry impulses, outnumber the neurons |
multipolar neuron | a neuron with numerous dendrites and one axon; motor and interneurons are this shape |
bipolar neuron | a neuron with two extensions from the soma, one extension being the dendrite and the other the axon; found in the eyes (rods and cones) |
unipolar neuron | a neuron with one extension from the soma that eventually splits into a separate dendrite and axon; found in ganglia outside the spinal cord |
sensory neuron | a neuron that carries an impulse from the PNS to the CNS |
interneuron | a neuron that connects a sensory and motor neuron, integrates information and makes decisions |
motor neuron | a neuron that carries an impulse from the CNS to the PNS |
afferent neuron | another term for a sensory neuron |
efferent neuron | another term for a motor neuron |
association neuron | another term for an interneuron |
PNS | peripheral nervous system that includes your spinal and cranial nerves |
CNS | the central nervous system that includes the brain and spinal cord |
nerve | a group/bundle of axons in the PNS |
tract | a bundle/group of axons in the CNS |
ganglion | a group of somas in the PNS |
nucleus | a group of somas in the CNS |
astrocyte | a star-shaped glial cell that physically supports neurons, helps transmit impulses by regulating ion concentrations; found in the CNS |
microglia | smallest type of glial cell, found in CNS and digests foreign particles |
Schwann cells | glial cells in the PNS that myelinate axons |
oligodendrocytes | glial cells that myelinate axons in the CNS |
ependymal cells | ciliated glial cells found within the ventricles of the brain and central canal of the spinal cord, the cilia helps circulate the fluid that surrounds the brain and spinal cord |