Lecture+6 - Action Potential Propagation (cont’d) • The...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Action Potential Propagation (cont’d) • The spread of excitability in a neuron is directional Fig. 4‐9a, p. 97 Fig. 4‐8, p. 95 Action Potential Propagation (cont’d) Contiguous Conduction Fig. 4‐9, p. 97 Action Potential Propagation (cont’d) Action Saltatory Conduction & Myelination Important Points: • Composed of lipids • Two types of glia • Schwann – PNS • Oligodendrocytes - CNS • Nodes of Ranvier • Gaps between myelin segments Fig. 4-12, p. 100 Action Potential Propagation (cont’d) Action Saltatory Conduction & Myelination Fig. 4-13, p. 101 Action Potential Propagation (cont’d) Action Comparing Contiguous & Saltatory Conduction Conduction Velocity 1.Resistance • ↑ diameter = ↓ resistance = faster 2.Leaks • Fewer leaks = faster 3.Capacitance • More insulation = faster Saltatory Conduction is Faster • APs only regenerated at nodes • Conduction is ~ 50X faster than seen with contiguous conduction. Neuron-to-Neuron Communication: Neuron The Chemical Synapse Each cell might have many inputs and/or many outputs Neuron-to-Neuron Communication: Neuron The Chemical Synapse – a closer look Fig. 4-15, p. 105 Neuron-to-Neuron Communication: Binding the postsynaptic receptor THINK OUTSIDE THE BOX !! What might cause an EPSP? What might cause an IPSP Fig. 4-16, p. 106 Neuron-to-Neuron Communication: Summation of inputs Fig. 4-17, p. 109 ...
View Full Document

This note was uploaded on 11/24/2011 for the course NPB 97952 taught by Professor ? during the Spring '09 term at UC Davis.

Ask a homework question - tutors are online