Lecture4--Neurons6

Lecture4--Neurons6 - 10/4/10 LECTURE OUTLINE CHAPTER 3:...

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10/4/10 1 C HAPTER 3: B IOLOGICAL PSYCHOLOGY Lecture 4: Neurons & Neurotransmitters (p. 124-129); Nature & Nurture (p. 137-145) L ECTURE O UTLINE An introduction to neurons Communication between neurons Nature versus Nurture? A N INTRODUCTION TO NEURONS Hi, I’m a neuron! HOW DOES THE NERVOUS SYSTEM WORK? The star of the show: Neurons ! Basic unit of the nervous system Nerve cell specialized for communication ~100 billion in the brain HOW DOES THE NERVOUS SYSTEM WORK? The supporting players: Glial cells Protect neurons and support functioning Found in the blood-brain barrier Create myelin sheath 90% of nervous system by number SPECIALIZED FUNCTIONS OF NEURONS Receive information from neighboring neurons (or sensory receptors) Integrate this incoming information Transmit signals to other neurons (or muscles)
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10/4/10 2 T YPES OF NEURONS Sensory neurons Afferent neurons Detect information from physical world and send to brain Motor neurons Efferent neurons Transmit signals from brain to muscles throughout body Interneurons Everything else in between Most neurons in the CNS Communicate only with other neurons BASIC STRUCTURE OF A NEURON Receives info Info in from previous neuron Action potential Releases chemicals (neurotransmitters) Info out to next neuron Integrates info aka Soma C OMMUNICATION BETWEEN NEURONS Why do neurons like e-mail? They like to send and receive lots of messages! HOW DO NEURONS SEND SIGNALS? Electrical impulses: Within a single neuron Action potentials (neuronal firing) Chemicals Between separate neurons Neurotransmitters INCOMING SIGNALS Chemical signals received by dendrites Excitatory Increase likelihood of action potential Inhibitory Decrease likelihood of action potential All incoming signals are added together Enough excitation Action potential BASIC STRUCTURE OF A NEURON Receives info Info in from previous neuron Action potential Releases chemicals (neurotransmitters) Info out to next neuron Integrates info aka Soma If Excitatory>Inhibitory. ..
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This note was uploaded on 11/08/2010 for the course PSC PSC 001 taught by Professor Paoli during the Fall '09 term at UC Davis.

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Lecture4--Neurons6 - 10/4/10 LECTURE OUTLINE CHAPTER 3:...

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