LSB258 Lecture Notes - Lecture 3: Brain Tumor, Micrograph, Ependyma
Document Summary
Nervous system: action potentials, electrical signals, complex electrochemical events, start in the cell body of the neuron, travel down an axon (0. 5-130m/s) Synaptic transmission: more specificity (targets particular parts, enables by synapses, rapid and specific form of communication, nervous system, simple functions. Long branched extensions off soma (dendritic tree: reception of input from other neurons or environment, dramatically increase the surface area of soma, axons. Increase conduction velocity of action potention (2. 5-130m/s: multiple sclerosis: caused by loss of myelin sheath, paralysis, 1. 5-20um diameter, oligodendrocytes or schwann cells wrap around the axons. Show up black in a micrograph: unmyelinated axon. Small diameter (0. 1 to 2. 0um: no myelin sheath, axon pockets of oligodendrocytes (schwann cells, provide insulation. Slow rate of action potential conduction (0. 5 to 2. 5 m/s: axon terminals, bulbous ends on the end of each axon branch, adjacent to the soma or dendrite of another neuron, enable communication between adjacent neurons. Structure is known as a synapse: neuroglia - support neurons.
