Autonomic Nervous System Introduction The autonomic nervous system
- Slides: 5
Autonomic Nervous System Introduction The autonomic nervous system (ANS) is the portion of the peripheral nervous system that functions independently and continuously without conscious effort. What are functions of your body that you do not consciously control? What are functions of your body that can operate without your conscious control?
Autonomic Nervous System Explicit Instruction The (ANS) Autonomic Nervous System has the task of maintaining homeostasis of the visceral activities without conscious effort. Divisions of the ANS ◦ The sympathetic division operates under conditions of stress or emergency. ◦ Fibers in the sympathetic division arise from the thoracic and lumbar regions of the spinal cord, and synapse in paravertebral ganglia close to the vertebral column ◦ Postganglionic axons lead to an effector organ
Autonomic Nervous System Explicit Instruction Divisions of the ANS (continued) ◦ The parasympathetic division operates under normal conditions ◦ Fibers in the parasympathetic division arise from the brainstem and sacral region of the spinal cord, and synapse in ganglia close to the effector organ
Autonomic Nervous System Explicit Instruction Neurotransmitters of the ANS ◦ Acetylcholine ◦ Sympathetic Preganglionic fibers ◦ Parasympathetic Preganglionic fibers ◦ Sympathetic Postganglionic fibers ◦ Norepinephrine ◦ Parasympathetic Postganglionic fibers
Autonomic Nervous System Independent Practice 1. Describe the parts of the autonomic nervous system and distinguish between its divisions. 2. Which neurotransmitters operate in the autonomic nervous system? 3. How do the divisions of the autonomic nervous system regulate visceral activity?
