CSD 212 Lecture Notes - Lecture 4: Central Nervous System, Peripheral Nervous System, Spinal Nerve
14 Sep 2016
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Document Summary
Nerves travel between cns and other parts of body. Carry one type of information (sensory or motor) Facilitate/support neurons, but do not transmit information. Cause excitation of muscle or gland (cns. Efferent neurons - information is being carried away from the cns. Carry sensory information into the cns (pns. Afferent neurons - information is being carried to the cns. In the cns, directly connect motor and sensory neurons. An electrical impulse that moves along the axon. Lasts less than 2 milliseconds (<0. 002 seconds) Ap is same each time, different frequency may affect neuronal response. Assisted by myelin, a glial cell which insulates the axon and enhances conduction of electrical signals. Space where terminal button approaches dendrites of next neuron. Neurotransmitters: chemical signals that pass between neurons at the synapse. Postsynaptic terminals have special receptor proteins which bond to neurotransmitters. Impulses are transmitted both electrically and chemically. Information is transmitted quickly- can be up to few hundred meters per second.
