Psych312_Week2Lecture2b_Anatomy&Physiology.pdf

Psych312_Week2Lecture2b_Anatomy&Physiology.pdf -...

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Anatomy and Physiology of Vision
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Outline Nerve physiology Retina
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Transduction Converting environmental energy (e.g., light or sound waves) into electrical signals
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Neuron 1. Soma (cell body): Contains nucleus, keeps cell alive.
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Neuron 2. Dendrites: Receive messages from other neurons
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Neuron 3. Axon: Carries information from cell body to terminal buttons.
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Neuron 4. Terminal buttons: Pass information to the next neuron. Releases neurotransmitters
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Synapse (not part of the neuron): Gap between terminal buttons of one neuron and dendrites of the next. Synapaptic transmission: Neurotransmitters can be excitatory or inhibitory One-directional Excitatory Inhibitory Neural communication
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Resting potential Resting potential: At rest, the charge inside a neuron is -70 mV (millivolts) Depolarization: Charge moves toward 0 mV Axon -70 mV Time (msec) -70 0 -45 30 Voltage (mV)
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Resting potential Resting potential: At rest, the charge inside a neuron is -70 mV (millivolts) Depolarization: Charge moves toward 0 mV Axon -70 mV -70 0 Threshold (-45 mV) Time Time Stimulus intensity Voltage Action potential
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  • Spring '08
  • Armstrong
  • Photoreceptor cell

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