Lecture 9-Autonomic Nervous System

Lecture 9-Autonomic Nervous System - Autonomic Nervous...

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1 Autonomic Nervous System Autonomic Nervous System (ANS) is part of the motor system that controls internal organs (viscera), and is thus also called viscera nervous system. Principle of Neural Science 4 th Ed. Fig. 49-1, p961 Somatic nervous system: Largely deals with voluntary somatic sensory and motor responses. Autonomic nervous system Largely deals with involuntary sensory and motor response of the internal organs.
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2 ANS controls smooth muscles, cardiac muscles and glands of the internal organs. ANS does NOT control skeletal muscles. ANS assists the body to maintain a constant internal environment (homeostasis). ANS also participates in coordinated responses to external stimuli: e.g. regulation of pupil size in response to change of light e.g. fight-or-flight response: release of adrenaline, increased heart rate, BP, etc.
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3 ANS has three major divisions: (1) Sympathetic nervous system (2) Parasympathetic Nervous system (3) Enteric Nervous System: Controls gastrointestinal tract, pancreas, gall bladder to mediate digestive reflex.
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Lecture 9-Autonomic Nervous System - Autonomic Nervous...

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