week_3_neurons_are_electric_2_3

week_3_neurons_are_electric_2_3 - Neurons are Electrical II...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
HD 220 Fall 2006 1 Temple, 2006 1 Neurons are Electrical II: Electricity in the Nervous System Week 3, Lecture 2 Temple, 2006 2 Electrical Nervous System • Electrical properties of neurons – Action potential – Integrating inputs • Putting it together – Sensation > movement • Clinical disorders – Lou Gehrig’s Disease •ALS –Mys then iaG rav is – Clinical Disorders: Epilepsy Temple, 2006 3 Action Potential
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
HD 220 Fall 2006 2 Temple, 2006 4 Graded Potentials Temple, 2006 5 Types of Gated Channels membrane + membrane + Voltage gated Ligand gated (Molecule binds) +++ +++ --- --- --- +++ --- +++ Can also have stretch activated – where stretching membrane opens channel Closed Open Temple, 2006 6 Post-synaptic Potentials • Potential that causes depolarization – Excitatory post- synaptic potential • EPSP • Potential that causes hypoerpolarization – Inhibitory post- synaptic potential •IPSP
Background image of page 2
HD 220 Fall 2006 3 Temple, 2006 7 Integration Temple, 2006 8 Temporal Summation Temple, 2006 9 Spatial Summation
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
HD 220 Fall 2006 4 Temple, 2006 10 Axon Hillock Axon initial segment (arrow) originating from the axon hillock at the base of a pyramidal cell (N -nucleus). Scale = 1 μm. (Mouse, neocortex.) http://synapses.bu.edu/atlas/contents.htm Temple, 2006 11 Summing Up Inputs • Graded potentials occur in the dendrites and on cell body of a neuron – These can be inhibitory or excitatory • Depolarizing or hyperpolarizing • If two inputs are close together in time – They add together • Temporal summation • If two inputs are close together on the neuron – They add together • Spatial summation • The effects of these changes travel towards the axon hillock and are summed together to see of reach action
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/28/2008 for the course HD 220 taught by Professor Anon during the Fall '06 term at Cornell.

Page1 / 10

week_3_neurons_are_electric_2_3 - Neurons are Electrical II...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online