PSYC 1101 Chapter Notes - Chapter 2: Axon Hillock, Sympathetic Nervous System, Peripheral Nervous System
23 Feb 2016
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Axons speak: myelin sheath is a layer of fatty tissue that insulates axons and speeds their impulses. They also may be covered with schwann cells. ** they are laid down until about age 25, after that natural efficiency, judgment, and self-control grows. If it breaks down, multiple sclerosis results (communication to muscles slows and loss of muscle control: action potential is a brief electrical charge that travels down the axon. **neurons transmit messages when stimulated by a signal or when triggered by a chemical signal, speed can be slow or fast. Fluid outside axon is mostly (+) charged and inside mostly (-). This state is called a)axons surface is selectively permeable. Pns to the brain b)reflex nerve centers are located in the spine. Sensory neuron is carried from stimulus spot to the spine and from there a motor neuron is sent to the muscle to contract: pns- autonomic and somatic, synthetic neurotransmitters peripheral nervous system.
