PSYC 100 Lecture Notes - Lecture 11: Schwann Cell, Myelin, Resting Potential

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Be sure that you are prepared to draw a neuron, label its structures and describe their purpose. neuron- cells that makes up our brain- Axon- tail of neuron- can stretch several feet- where distance of signal gets traveled- take info away from soma. Dendrites- branches that form off the soma, tend to be where neuron receives its signal- they take info to the soma. Schwann cells- make up myelin sheath around the axon- allows these impulses to travel ef ciently are these insulating cells. Terminal- where the axon ends and where it can connect. Terminal buttons nodes of ranvere- slots where there are no schwann cells. 05-b action potentials nuerons send messages electrochemically-chemical causes electrical signal- electrically charged chemicals are called ions (na and k) What does it mean when a neuron reaches its threshold? if the change in nerves electrical charge is great enough some sodium pumps begin to open,-55 mv.

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