NROSCI 1000 Study Guide - Fall 2018, Comprehensive Midterm Notes - Tight Junction, Spinal Cord, Neuron
Document Summary
Reticular theory : nerve network comprising continuous protoplasmic links. Silver solution that randomly stains about 1% of neurons. Used golgi method to disprove golgi"s theory. Made detailed drawings and analyses of neural tissues. Showed that there"s no continuity between neurons. Contributed to the neuron doctrine and principle of dynamic polarity. Nerves conveyed fluid from the brain and spinal cord to the periphery. Until 1900"s, nervous system was a syncytium. Individual neurons are the units and signaling. Neural processes (dendrites and axon) grow from the cell body when neurons are isolated in culture. Brainbow: developed by jeff lichtman and joshua sanes. Can be very very long (end of spinal cord to big toe) Vascular endothelial cells: smooth muscle cells, form blood vessel tissues. Electrical signals within a neuron flow in one direction. Principle described by cajal based on studies. Number of dendritic branches = number of inputs. Nodes of ranvier: breaks in myelin with concentrated channels.
