PSYCH 202 Lecture Notes - Lecture 12: Franz Nissl, Axon Hillock, Golgi'S Method
19 Jan 2018
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Document Summary
It doesn"t stain every neuron it comes in contact with: nissl stain, doesn"t stain axon or terminals, the greatest density is typically in layer 4. 2 major classes of cells in cns: neurons, glia, organized by, shape, anatomy. Different types of neurons: multipolar, most prevalent neurons, a lot of dendrite extensions and one axon, found throughout the brain in cns and pns, bipolar, one dendrite extension and one axon, found mainly in the sensory system, unipolar. Ion channels: allows ions like sodium, potassium, and chloride to flow through. Synaptic cleft: space between presynaptic neuron and postsynaptic neuron. Glia: types and functions: oligodendrocytes, produce myelin in cns for insulation of axons; increases velocity of action potential. Inside of the cell: positively charged k+ ion, negatively charged anions. Ions like to spread out in the space available: electrostatic pressure, similar forces are repelled, opposite forces attract, na+/k+ proportionate differences across membrane require, na+/k+ pump, leaky k+ channels.
