100_Chap7_Sum10_Neurons

100_Chap7_Sum10_Neurons - Chap 7: Neurons The Matter of the...

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Chap 7: Neurons The Matter of the Mind
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Neurons: The Matter of the Mind Neurons have dendrites, a cell ody, and an on body, and an axon The nerve impulse is an electrochemical signal
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Neurons: The Matter of the Mind Synaptic transmission is communication between neurons
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Cells of the Nervous System The nervous system is divided into The c entral n ervous s ystem (CNS) The brain and spinal cord he ripheral rvous tem (PNS) The p eripheral n ervous s ystem (PNS) All of the nervous tissue in the body besides except the brain and spinal cord
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Cells of the Nervous System Neurons Excitable cells that generate and transmit messages euroglial lls lso called glial cells) Neuroglial cells (also called glial cells) More numerous and provide structural support, growth factors, and insulating sheaths around the nerves Able to reproduce, unlike neurons
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Neuron Categories Sensory (or afferent) neurons Carry information toward the CNS from sensory receptors otor r efferent) eurons Motor (or efferent) neurons Carry information away from the CNS to an effector
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Cells of the Nervous System Sensory receptor for pain Muscle (effector) Figure 7.1 Interneuron Motor neuron Sensory neuron Cell body Impulse direction
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Cells of the Nervous System Association neurons (or interneurons ) Located between sensory and motor neurons within the CNS, where they integrate and interpret sensory signals Account for more than 99% of the body’s neurons
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Neurons Have Dendrites, a Cell Body, and an Axon Dendrites receive information from other neurons or from the environment. The cell body controls the cell’s metabolic activities. Axon endings release chemicals called neurotransmitters that affect the activity of nearby neurons or an effector (muscle or gland). Figure 7.2 The cell body integrates input from other neurons. An axon conducts the nerve impulse away from the cell body. Receiving portion of neuron Sending portion of neuron Cell body Axon endings Nucleus
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Neurons Have Dendrites, a Cell Body, and an Axon The shape of a typical neuron is specialized for communicating with other cells. It has: Many short, branching projections called endrites (one or more) dendrites (one or more) A single long extension of the neuron called an axon (one) A cell body (one) which contains the nucleus and other organelles, and functions to maintain the neuron
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Neurons Have Dendrites, a Cell Body, and an Axon Dendrites Carry information toward the cell body of a neuron ngle ng n ay A single long a xon ( away ) Carries information away from the cell body
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This note was uploaded on 10/06/2011 for the course BIO 100 taught by Professor Staff during the Spring '11 term at S.F. State.

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100_Chap7_Sum10_Neurons - Chap 7: Neurons The Matter of the...

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