CAS PS 231 Lecture Notes - Lecture 1: Sensory Neuron, Motor Neuron, The Sequence
20 Sep 2016
School
Department
Course
Professor
Document Summary
Ex. in leg exion re ex, a sensory neuron excites a second neuron in turn which excites a motor neuron, which excited a muscle. Re ex arc: the circuit from sensory neuron to muscle response. Speed of a reflex and delayed transmission at the synapse. Delay in re exes and derived from one neuron communicating directly with another. Sherrington found that the velocity of conduction through a re ex arc was slower than the velocity of an action potential along an axon. Therefore, some delay must occur at the junction between one neuron and the next. Sher found that repeated stimuli within a brief time have a cumulative effect ( temporal. Ex. light pinch of dogs foot did not do anything, but a number of little punches in a short period of time did. Postsynaptic neuron: on that receives neuron transmission.
