Psychology 1000 Chapter Notes - Chapter 3: Corpus Callosum, Autonomic Nervous System, Basal Ganglia

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: John Campbell

Document Summary

100 billion at birth, lose 10,000 every day. Contains biochemical structures needed to keep the neuron alive. Nucleus carries genetic information that determines how the cell develops and functions. Branch-like fibres that emerge from the cell body. Collect messages from neighbouring neurons and send them to cell body. Extends from cell body, conducting electrical impulses to other neurons, muscles, or glands. Glial cells surround neurons and hold them in place. Also manufacture nutrients, form myelin sheath, absorb toxins and waste. Guide newly divided neurons to place in brain during development. Inside of neuron is more negative, causing it to be more electrically negative. Action potential (nerve impulse) is a sudden reversal in neuron"s membrane voltage. Depolarization - changes from 70 mv to +40 mv. Graded potentials changes proportional to the amount of incoming stimulation. If potentials aren"t very strong, the neuron will be partially depolarized, but not enough for action potential.