PSYC1020 Lecture Notes - Lecture 7: Microglia, Sodium Channel, Axon Hillock
Document Summary
Neurons are made up of: dendrites, cell body, axon terminals or synapses, myelin. Cell body: common to all cells, contains nucleus and all structures necessary for cell functioning. Dendrites: dendron, unique to neurons, receives signals, many per neuron, receives input from many other neurons. Axon terminal/terminal boutons: terminal boutons, forms synapses with another neuron, sends information to that neuron, secretes neurotransmitters when an action potential reaches them. Join axon terminals of one neuron to dendrites of another neuron for transmission of signals: one direction signals, pre-synaptic, before the synapse - from cell body to axon terminal, post-synaptic, after the synapse. Neurons: electrical signals: signals = action potential, pulse travels along the axon, fixed size - either on or off, signal or no signal, terms to know, membrane potential, resting potential, action potential. Cell membrane wall: 70% of the brain is water, water surrounds cells, extra-cellular fluid - outside cell, water fills the cells.
