PSYC 280 Study Guide - Frontal Lobe, Horseradish, Motor System

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Document Summary

Thanks to microscopes (19thc) they were able to look at the shapes and sizes of neurons in the brain. But how the neurons interacted was a mystery. Golgi thought neurons were continuous with one another forming a tube of network line/connection. Cajal said neurons are very close to each other but aren"t continuous, but separated between tiny gaps. The brain is composed of separate neurons and other cells are independent structurally, metabolically, and functionally. Info is transmitted from each cell across the tiny gaps (synapse) The human brain has 1015 synapses: organelles in a neuron: (cid:176) mitochondria :a cellular organelle that gives metabolic energy for the cell"s processes. Dendrites: cellular extensions, receives info from other neurons (input zone) Cell body/soma: has the cell nucleus, receive synaptic contacts; inputs are combined and transformed here (an integration zone) Axon: sends the cell"s output info in electrical signals away from the cell body (construction zone)

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