CAS BI 108 Lecture Notes - Lecture 1: Endoplasmic Reticulum, Resting Potential, Peripheral Nervous System
6 Apr 2016
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Document Summary
Complexity matched with behavior of an organism. Ganglia collection of neurons that has own function present in earthworms. Nerve chord coordinates activity of different ganglia to produce movement. Anterior ganglia communicates with other ganglia. Other organisms have specialized ganglia for vision and other functions, i. e squid, octopii. Many of nervous system research was done on aplysia ganglion. Spinal cord carries information to and from the brain. Brain is very metabolically active - 20% of activity. Everything not part of brain and spinal cord. Extremely polarized - anatomically and electrically polarized. Neurons are very metabolically active and synthesizes a lot of protein. Dendrites are the primary input to the cell. Receives synapses - input portion of the cell. Axons are the output of the cell. Complexity of dendritic arborizations is a reflection of the complexity of the input. Very common , 20% of cells in nervous system. Form the blood brain barrier - prevents bacteria, ect from diffusing into the brain.
