PSYCH101 Lecture Notes - Lecture 4: Myelin, Extracellular Fluid, Neurotransmitter

• School: University of Waterloo
• Department: Psychology
• Course: PSYCH101
• Professor: Stephanie Denison

Document Summary

Interneuron"s exist in cns and carry messages from one set of neurons to another, they collect, organize and integrate messages from various sources: human nervous system - few million sensory and motor neurons & 100 billion interneuron"s. Motor neurons and interneuron"s dendrites extend directly off cell body forming bush like structures structures increase the surface area of cell which allows receipt of signals from many other neurons. Sensory neurons, dendrites extend from one end of axon (rather than directly from cell body) , extend into sensory organs and respond to sensory signals (sound waves in ears or touch on the skin) o. Synapse - junction between each axon terminal & cell body or dendrite of receiving neuron. When action potential reaches axon terminal it causes terminal to release packets of chemicals called neurotransmitters. Neurotransmitter move across space between the cells & alter receiving neurons in ways that influence its production of action potentials.