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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The Brain in Two Parts: How it Works and What it Does
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The Nervous System The Body’s electrochemical communication system Divided into two parts: The Central Nervous System and the Peripheral Nervous System
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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
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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
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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
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Motor or Efferent Neurons: carry the brains output muscles, glands and organs Interneurons: CNS neurons that mediate sensory input and motor output
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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
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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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