2. What Are The Three Major Types Of Neurons? How Are They Functionally Different?

730 Words 3 Pages
Elisabeth Helms
Professor Michel
PSY 435-01
28 August 2015

Assignment #2
What are the 3 major types of neurons? How are they functionally different? Why are the functional differences important?
There are 3 major neurons that the nervous system uses to carry information throughout the body; sensory neurons, interneurons, and motor neurons. Each type of neuron, all functionally different, interacts with the central nervous system, the brain, and the muscles of the body. Some vary in shape and sizes as well as differ in simplicity and complexity. Neurons play a big role in communication between cells, as well as for processing information, and the usage of memory. Each neuron has a similar structure; the cell body, axon, dendrites, terminal
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As presented in figure 3-5 in the textbook, the sensory neuron is simple in that its dendrites are small in number. The function of the sensory neuron is to carry information coming from the sensory receptors and sensory organs (ex: nose, skin, eyes, etc.) to the brain and spinal cord. The sensation of temperature (such as hot and cold) is received through nerves in the skin that send information to sensory neurons. Some examples of sensory neurons are the somatosensory neuron, and the bipolar neuron. The somatosensory neuron provides information from the body to the spinal cord which inadvertently provides information to the central nervous system (CNS). A bipolar neuron (ex: retinal cells), directs information from the retina to visual receptors in the …show more content…
Also known as association cells, connect a neuron to another neuron (ex: sensory neuron to motor neuron). Because they are the bridge between sensory and motor neurons, they collect information from many different sources. One type of an interneuron, the pyramidal cell, carries information from the cortex to the brain and spinal cord. The Purkinje cell, another interneuron, carries information from the cerebellum to the brain and spinal cord. One unique fact about interneurons is that you can find most of these in the brain. The larger the brain, the more interneurons are found. Motor neurons have larger, more complicated networks of dendrites. Located in the spinal cord, and bottom of the brain stem, the motor neurons’ large axon reaches to the muscles of the body. They help the contraction of muscles, as well as mediate behavior (reflexes). Any efferent information must pass through motor neurons to get the

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