PSYA01H3 Lecture Notes - Lecture 6: Multiple Sclerosis, Myelin, Somatic Nervous System
Document Summary
Chapter 3, slide 1: central nervous system- brain and spine, peripheral nervous system- autonomic and somatic nervous system, examples: Touching a hot iron- sensory neurons detect the heat and send an excitatory message to inter-neurons in spinal cord or brain. Inter neurons send signals to motor neurons to retract hand immediately. Carrying a hot casserole dish- heat makes you want to drop dish. Neurons: nucleus receives information from axon and terminals, twitter analogy- we are the receivers from our followers. Information we receive is from electro chemical changes: chemicals stimulate reactions that create positive or negative signals, myelin sheath insulates layer of transmission. If theres not enough myelin, multiple sclerosis develops.
