PSYC 2560 Lecture Notes - Lecture 6: Axon Hillock, Traumatic Brain Injury, Donald O. Hebb
1 Apr 2016
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Sigmund freud: proposed a theory based on connections in neuronal systems that changed with experience. Donald hebb: neuropsychologist, neurons that fire together wire together . Dendrites receive information from other neurons (electrical), which travels down to the cell body, axon hillock (final decision maker) decides if a signal will be sent down the axon (like a cable) Axons are covered in myelin sheaths, which act as insulation, shielding the signal from the surrounding environment (extracellular space) Nodes of ranvier and breaks between segments of myelin. Terminal buttons convert electrical impulses to chemical signals. Multipolar neurons: multiple processes coming off of it (axon and a bunch of dendrites) Unipolar neurons: one process coming off of it (more common in sensory systems) Bipolar neurons: two processes (one in, one coming out) Originally thought to be important as a support for neurons, but they"re more important than that. Oligodendrocytes: they myelinate axons (found in the cns).
