PSYC 1010 Lecture Notes - Lecture 4: Motor Control, Central Nervous System, Neuroglia

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5 Dec 2017
School
Department
Course
Professor
Biological basis
Phrenology feeling your head and you know if the guy is an asshole (Gall)
Phineas Gage railroad tie guy, got more aggressive after
Biological basis
o Brain
Consistency of gelatin
Weighs about 3 pounds
Considered by many to be the most complicated structure in
the universe
Neurons nerve cells in the brain that specialize in communication
o 85,000,000,000 in the brain (LA to NYC and back 5 times)
o 160,000,000,000 connections
o Sensory from tissues and sensory receptors inward to spinal cord
and brain (few million)
o Motor from brain and spinal cord to muscles (few million)
o Interneurons internal communication in brain (billions and billions)
o No two are alike, but they have same basic features
o Dendrites branching fibers that receive messages (listen)
o Axon long, tube like structure that conveys impulses away from cell
body toward other neurons OR toward muscles OR toward glands
(speak)
Can project several feet through body
o Myelin sheath fatty insulator that wraps around axon
o Terminal buttons knobs at end of axon that secrete chemicals to
other neurons
o Synaptic cleft space between two neurons-where synapse takes
place
Neural communication
o Within neurons messages move electrically
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