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相关概念视频

Parasympathetic Division of the ANS01:08

Parasympathetic Division of the ANS

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The parasympathetic division of the autonomic nervous system (ANS) regulates rest and digestion functions in the body. It works in opposition to the sympathetic division, promoting relaxation, conservation of energy, and digestion. The parasympathetic division consists of preganglionic fibers originating from specific cranial nerves (III, VII, IX, X) and the sacral spinal nerves (S2-S4). These fibers synapse with postganglionic neurons in the terminal ganglia, innervating various organs and...
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Autonomic Nervous System: Overview01:26

Autonomic Nervous System: Overview

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The human nervous system is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord, while the PNS contains nerve cells, clusters of nerve cells, and the sensory receptors that are outside the CNS. The PNS has two types of nerve cells: sensory (afferent) and motor (efferent). Sensory cells send signals to the CNS from receptors, and motor cells carry signals from the CNS to organs, muscles, and...
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Cranial Part of Parasympathetic Division01:18

Cranial Part of Parasympathetic Division

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The cranial part of the parasympathetic division plays a crucial role in regulating the visceral functions of the head and specific structures in the neck, thoracic, and abdominopelvic cavities. Preganglionic fibers of the parasympathetic division exit the brain through cranial nerves III (oculomotor), VII (facial), IX (glossopharyngeal), and X (vagus), delivering parasympathetic output to the respective visceral structures.
The vagus nerve (cranial nerve X) alone accounts for approximately 75...
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Autonomic Nervous System01:22

Autonomic Nervous System

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The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
The ANS comprises two main divisions: the sympathetic and parasympathetic divisions. These divisions function antagonistically to maintain a dynamic...
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The Parasympathetic Nervous System01:14

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Overview
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Parasympathetic Signaling01:30

Parasympathetic Signaling

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Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
The effects of...
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相关实验视频

Updated: Mar 12, 2026

Dissection of Pelvic Autonomic Ganglia and Associated Nerves in Male and Female Rats
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体自主流出是同情的

I Espinosa-Medina1, O Saha1, F Boismoreau1

  • 1Institut de Biologie de l'École Normale Supérieure (IBENS), INSERM, CNRS, École Normale Supérieure, Paris Sciences et Lettres Research University, Paris, 75005 France.

Science (New York, N.Y.)
|November 19, 2016
PubMed
概括

长期以来被认为是副交感的神经系统,实际上与交感神经系统有共同的特征. 这一发现重新定义了自主神经系统.

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科学领域:

  • 神经科学
  • 发育生物学
  • 进化生物学

背景情况:

  • 自主神经系统 (ANS) 传统上被分为副交感和胸腔交感外流.
  • 控制排便和排尿等功能的骨盆内脏神经被归类为副交感神经,起源于神经神经.

研究的目的:

  • 重新评估自主神经系统中神经外流神经元的分类.
  • 研究大脑和神经外流的表型和本体特征.

主要方法:

  • 对15种表型和本体遗传特征进行比较分析.
  • 在副交感和胸腔交感外流中区分前和后神经元.
  • 根据这些已确定的标准来评估神经外流.

主要成果:

  • 根据所有15个特征,神经外流神经元与胸脊交感神经元是不可区分的.
  • 大脑外流神经元表现出不同的特征,使它们与胸神经元区分开来.
  • 这挑战了一个世纪的圣神经分类纯粹是副交感的.

结论:

  • 自主神经系统可能具有双重结构,其中神经专门服务于副交感功能,脊髓神经 (胸部至神经) 服务于交感功能.
  • 这一修订后的框架为骨盆神经生理学,自主发育和进化提供了新的见解.