click below
click below
Normal Size Small Size show me how
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 |