Peripheral nervous system pns is divided into motor

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Unformatted text preview: ervous system (nerves, sensory organs). • Peripheral nervous system (PNS) is divided into: • Motor portion • somatic system: controls voluntary muscles (though they can be involved in an involuntary response, such as a reflex arc) • Autonomic system: controls involuntary responses (though conscious training, such as meditation or relaxation techniques, can allow people to affect the degree of response) • Sympathetic division: “fight or flight” • Parasympathetic division: “rest and rumination” • Sensory portion • Sensory receptors collect information: chemoreception, mechanoreception, photoreception, etc. • Sensory neurons transmit signals, informing the brain of what is going on in the environment. • Central nervous system is divided into: • Brain • Hindbrain made up of medulla, pons, and cerebellum • Medulla controls autonomic functions, such as breathing and heart rate. • Pons appears to control stages of sleep. • Cerebellum stores many motor memories and coordinates body movements. • Midbrain contains the reticular formation, which relays and filters sensory information. • Forebrain includes thalamus, limbic system, and cerebral cortex. • Thalamus channels sensory information to the limbic system and cerebral cortex. • Limbic system controls basic emotions, drives, and behaviors. • Hypothalamus integrates the nervous and endocrine systems. • Amygdala produces sensations of pleasure, fear, or arousal. • Hippocampus is involved in emotions, and is critical for storing experiences into memory. • Cerebral cortex is divided into regions that process sensory and motor information, store memories, and carry out the most complex thought and reasoning. May be the part of the brain that produces “mind.” Notes Biology 103 Dr. Karen Bledsoe http://www.wou.edu/~bledsoek/ • Sensory organs can be classified by the...
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