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Psych 1100, Week 3 Notes

by: Sahar

Psych 1100, Week 3 Notes PSYC 1100


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Neuron structure and function (p.1 of 2)
General Psychology I
Dr. Susan Holt
Class Notes
neuron, psych
25 ?




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This 3 page Class Notes was uploaded by Sahar on Saturday September 24, 2016. The Class Notes belongs to PSYC 1100 at University of Connecticut taught by Dr. Susan Holt in Fall 2016. Since its upload, it has received 7 views. For similar materials see General Psychology I in Psychology (PSYC) at University of Connecticut.


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Date Created: 09/24/16
Psych Notes Neuron  Cell of the nervous system o 3 types:  Sensory: takes info from sense organs and brings it into the nervous  system  Window to the outside world o Motor: takes info from the nervous system and brings it to the muscles and glands o Inter­neuron: found in the brain and spinal cord and they do central processing.  Connect with sensory, motor, or other inter­neurons  99% of neurons are interneurons o Support cells:  Glia cells: support cells for the nervous system  Guide neurons to their correct destinations during pre­natal development  Acts as insulation as it develops myelin  Myelin: permits an action potential to be conducted quickly along the  neuron’s axon  Neurotransmitter: Chemicals released from synapses that activate other neurons o Any excess is reuptaken into the axon terminal Neuron Structure  Dendrite: receives information from other neurons  Cell body OR Soma: collects and combines incoming information  Axon: conducts action potential away from cell body/soma  Myelin sheath: fiber along which action potential is generalized  Node of Ranvier: gap that permits the fast propagation of an action potential from gap to  gap  Axon terminal OR Synaptic knob: contains synaptic vessels that pull, then release the  neurotransmitter Red arrow shows direction of action potential across the neuron Neuron Function  Action ^  Resting Potential: the inside of the neuron is negatively charged compared to the fluid  around the neuron (negative charge is ­70 millivolts)  Graded Potential: can change the excitatory influence to make the charge more positive.  If the influence is inhibitory, the charge is more negative At ­50 millivolts (threshold), action potential is generated  Action Potential: is generated at threshold. The action potential is triggered, and neuron  permeability changes, sending Na+ (Sodium) rushing into the Node of Ranvier. Because  of this influx of sodium, there is an increase in action potential. o At a certain point, a sodium barrier is put up so no more sodium can enter, and  then K+ (Potassium) leaves the cell, decreasing the charge of the cell  At negative potential, it is harder to generate potential than it is after a period of rest


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