01:119:116 Lecture Notes - Lecture 19: Sensory Neuron, Electric Current, Axon Hillock
12 Nov 2018
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Synapses & sensory receptors(ch 48. 4, 49. 4, 50. 1, 50. 2) Junction between synaptic terminal & another neuron or effector. Separates presynaptic neuron from postsynaptic cell: presynaptic neuron. In this example, binding triggers opening, allowing na+ and k+ to diffuse through: neurotransmitter. Examples: acetylcholine- muscle stimulation, memory, learning, dopamine- brain, mood, endorphins- pain regulation. Membrane hyperpolarizes: summation of postsynaptic potentials. Mp is summed effect of all esps and ipsps. Memory and learning: nervous system development, embryonic development, gene expression and signal transduction, competition among neurons. Growth supporting factors: synaptic elimination, after birth, brain remodeled, neuronal plasticity, connections between neurons can be modified. Ns can be remodeled in response to its own activity. 2: formation of memories, stm- short term memory. Info accessed via temporary links formed in hippocampus. Acquiring memories not maintaining: ltm- long term memory. Permanent connections within cerebral cortex: ltp- long term potentiation, lasting increases in strength of synaptic transmission.
