CAS PS 222 Chapter Notes - Chapter 2: Procaine, Sodium-Potassium Alloy, Chloroform
10 Aug 2018
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Chapter 2: introduction to the physiology of perception. The brain has modular organization: specific areas of the brain have specific functions. The sensory modalities have primary receiving areas: vision occipital lobe, audition temporal lobe, tactile senses parietal lobe. What is a neuron: nerve cells (cells of the cns, about 100 billion in the brain. Basic structure of neuron: dendrites: receive information, cell body (soma) with a nucleus, axon or nerve fiber covered with fatty sheath (myelin, information comes in through dendrites, down axon, through terminal buttons, and then to nts. Basic types of neurons: receptors: receiving information from the environment; they are specially designed for appropriate information. Ex: in the visual system they are rods and cones. Different structures of receptors are specialized to respond to different types of energy. Touch: pressure on skin: afferent (sensory) Send signals from the sense, skin muscles and organs to the cns: efferent (motor) Sending information from the cns to the muscles, glands, organs.
