The+Brain+in+Two+Part 2 9-9

The+Brain+in+Two+Part 2 9-9 - The Brain in Two Parts How it...

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Unformatted text preview: The Brain in Two Parts: How it Works and What it Does The Nervous System • The Body’s electrochemical communication system • Divided into two parts: The Central Nervous System and the Peripheral Nervous System The Central Nervous System • Made up of the brain and the spinal cord • 99 % of neurons are located in CNS • Functions include: receiving, processing, and storing incoming information; sends out messages to muscles, glands and internal organs • The central command system which controls thought and movement The Peripheral Nervous System • Nervous system outside the brain and spinal cord which handles input and output of the CNS • Connects the brain and spinal cord to the other areas of the body Neurons • Individual Cells which receive, integrate and transmit information • Sensory or Afferent Neurons: carry information to the brain from the skin, muscles or organs. • Ex: putting your hand on a hot stove, neurons give message to brain saying this is HOT • Motor or Efferent Neurons: carry the brains output muscles, glands and organs • Interneurons: CNS neurons that mediate sensory input and motor output How it All Works: Neurons in Action • Neurons are the nerve cells which communicate to, from or inside the CNS • Glial cells: hold the neurons in place, nourish and insulate neurons. Non-neuron cells which provide a supportive function The Structure of A Neuron • Dendrites: receive messages from other neurons, transmit to the body cell • Cell body/soma: Keep neurons alive; contains substances for growth, determines whether to fire • Axons: Transmit messages away from the cell body to other neurons, muscles, or glands •...
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This note was uploaded on 12/08/2010 for the course PYSCH 111 taught by Professor Malley during the Spring '08 term at University of Michigan.

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The+Brain+in+Two+Part 2 9-9 - The Brain in Two Parts How it...

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