PSY-2012 Lecture Notes - Lecture 2: Peripheral Nervous System, Central Nervous System, Axon Terminal
Document Summary
Parts of the neuron, peripheral, central nervous system: neurons. Cell body life support center of the neuron. Dendrites wirey, receiving portion of neuron, branched extensions. Axon inner part of a neuron that extends, covered by a myelin sheath that insulates and speeds up messages. Terminal button branched endings of axon that transmits to other neurons. Synapse gap at end of terminal button, sent across gap in form of neurotransmitters: action potential. Each neuron must reach a threshold to fire. Chemicals that determine if the neuron fires or not. Serotonin, makes us feel more in an elevated mood. After they fire, they go back into the terminal botton: the nervous system. Central nervous system brain and spinal chord. Peripheral nervous system sensory and motor neurons that connect cns to the rest of the body. Sympathetic adrenaline, everything increases, survival, dilating pupil.
