11 Synapses - Biology141 (Physiology) 4/6/08 1:02 AM...

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4/6/08 1:02 AM Biology141 (Physiology) Page 1 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%2011(2008).htm Biology141 (Physiology) Lecture 11 M. Whim SYNAPSES. [1]. BACKGROUND. a synapse is: a functional connection between a neuron and a second cell . between the “ presynaptic” cell and the “ postsynaptic” cell. how do synapses differ between the CNS and PNS? a neuron neuron synapse is between the (presynaptic) axon and (postsynaptic) dendrites. [2]. ELECTRICAL SYNAPSES. 2 neurons connected by a low resistance pathway. electrical synapses allow 2 way transfer of information . also called “gap junctions” how does electrical current flow between the coupled cells? gap junctions are found in (1). cardiac muscle, (2). between some CNS neurons, (3). between glial cells. [3]. CHEMICAL SYNAPSES. most synapses in the nervous system are chemical. they allow 1 way transfer of information . release occurs from presynaptic endings called “
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11 Synapses - Biology141 (Physiology) 4/6/08 1:02 AM...

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