Textbook Question
What are the major components of
(c) the enteric nervous system?
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14. The Autonomic Nervous System
Introduction to the Autonomic Nervous System
Problem 15
Textbook Question
Which three collateral ganglia serve as origins for ganglionic neurons that innervate organs or tissues in the abdominopelvic region?
Verified step by step guidance1
Understand the concept of collateral ganglia: Collateral ganglia are part of the sympathetic division of the autonomic nervous system. They are located outside the sympathetic chain and serve as origins for ganglionic neurons that innervate organs in the abdominopelvic region.
Identify the three main collateral ganglia: The three collateral ganglia associated with the abdominopelvic region are the celiac ganglion, superior mesenteric ganglion, and inferior mesenteric ganglion.
Learn the functions of each ganglion: The celiac ganglion primarily innervates the stomach, liver, pancreas, and spleen. The superior mesenteric ganglion innervates the small intestine and parts of the large intestine. The inferior mesenteric ganglion innervates the distal large intestine, rectum, kidneys, bladder, and reproductive organs.
Understand the pathway of ganglionic neurons: Preganglionic neurons from the spinal cord synapse with postganglionic neurons in these collateral ganglia. The postganglionic neurons then extend to the target organs in the abdominopelvic region.
Review the anatomical location: The celiac ganglion is located near the base of the celiac trunk, the superior mesenteric ganglion is near the superior mesenteric artery, and the inferior mesenteric ganglion is near the inferior mesenteric artery. This anatomical positioning helps them efficiently innervate their respective target organs.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Collateral Ganglia
Collateral ganglia are clusters of nerve cell bodies located outside the central nervous system, specifically in the sympathetic division of the autonomic nervous system. They serve as relay points for sympathetic fibers that innervate various organs, particularly in the abdominal and pelvic regions. Understanding their location and function is crucial for comprehending how autonomic signals are transmitted to target tissues.
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Sympathetic Nervous System
The sympathetic nervous system is one of the two main divisions of the autonomic nervous system, responsible for the body's 'fight or flight' response. It prepares the body for stressful situations by increasing heart rate, dilating airways, and redirecting blood flow to essential organs. Knowledge of this system is essential for understanding how collateral ganglia influence physiological responses in the abdominopelvic region.
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Abdominopelvic Innervation
Abdominopelvic innervation refers to the supply of nerves to the organs and tissues located in the abdominal and pelvic cavities. This area includes vital organs such as the stomach, intestines, and reproductive organs, which are innervated by specific ganglionic neurons originating from collateral ganglia. Recognizing the specific ganglia involved helps in understanding the autonomic control of these organs.
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