PSYC 101 Chapter Notes - Chapter 2: Jean Dominique, Myelin, Reticular Formation
4 Oct 2016
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Glia cells support functions (provide nutrients and remove wastes) for neurons, play role in neural signaling and formation of neural networks in brain. Myelin lipid covering made of glial cells. Dendrites receive incoming signals from other neurons. Axon carries signals away from the cell body. When a neuron is myelinated, the axon is the covered part, myelin sheath. Axon bulb contains vesicles that hold neurotransmitters chemical messengers that carry signals across the synapse. Synapse junction between 2 neurons where the axon bulb of one neuron comes into close proximity with receptor sites on another neuron. Brain uses electrochemical energy produced by charged particles called ions to send neural signals. (na+ & k+ mainly) Resting potential imbalance in types of ions found inside and outside the cell walls of neuron. Openings in the axon (ion channels) allow only some ions to pass into and out of the neuron.
