A Wisdom Archive on Sympathetic nervous system

The sympathetic nervous system (SNS) is one half of the autonomic nervous system; the parasympathetic nervous system (PNS) is the other. Sympathetic nervous system - Function. The sympathetic nervous system activates what is often termed the "fight or flight response". This response is also known as sympathico-adrenal response of the body, as the pre-ganglionic sympathetic fibers that end in the adrenal medulla (but also all other sympathetic fibers) secrete acetylcholine, which activates t ... Including:

• Sympathetic nervous system - Function
• Sympathetic nervous system - Organization
• Sympathetic nervous system - Information Transmission

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The sympathetic nerves emerge near the spinal cord, inside the vertebral column, travelling along the path of the nerve roots. After a few twists and turns, sympathetic nerves branch off and travel into major organs, glands, and other groupings of nerves (called ganglia). [1] Its cells originate toward the middle of the spinal cord in the intermediolateral cell column (or lateral horn), beginning with cells in the first thoracic segment of the spinal cord and extending into the second or third lumbar segments. Because its cells begin ...

Read more here: » Sympathetic nervous system: Encyclopedia II - Sympathetic nervous system - Organization

sympathetic nervous system
1.    Nervous system influenced by soul mind in charge of instinct, automation, involuntary functions and the memory bank of past incarnations.
2.    Controller of the fight-or flight system and the activity of the sweat glands that shows the individuals degree of excitement or calmness by activating chemicals and processes in the fight-or-flight system

 
(See also: Sympathetic nervous system, Body Mind and Soul )

For more dictionary entries, see » sympathetic nervous system dictionary

The cranial sympathetics include sympathetic efferent fibers in the oculomotor, facial, glossopharyngeal and vagus nerves, as well as sympathetic afferent in the last three nerves. The Sympathetic Efferent Fibers of the Oculomotor Nerve probably arise from cells in the anterior part of the oculomotor nucleus which is located in the tegmentum of the mid-brain. These preganglionic fibers run with the third nerve into the orbit and pass to the ciliary ganglion where they terminate by forming synapses with sympathetic motor neurons whose ...

Read more here: » Autonomic nervous system: Encyclopedia II - Autonomic nervous system - The Cranial Sympathetics

The autonomic nervous system regulates bodily functions and the activity of specific organs. For example, the ANS plays a role in narrowing (constricting) and widening (dilating) blood vessels; increasing heart rate and the force of contraction in the heart's beating action. Another example is how the ANS controls constriction and dilation of airways (bronchioles) in the lungs. The ANS plays a role in many important physiological processes. A partial list includes: digestion, respiration, perspiration, constriction and dilation of the pupils, relaxation and contraction of the bowels and sphincters, erection and ejacul ...

Read more here: » Autonomic nervous system: Encyclopedia II - Autonomic nervous system - Function

The autonomic nervous system is the part of the nervous system of the higher life forms that is not consciously controlled. It is commonly divided into two usually antagonistic subsystems: the sympathetic and parasympathetic nervous system. The autonomic nervous system controls such vital functions as heart rate, dilation of the bronchioles and dilation and constriction of the pupil; the digestive tract is controlled almost completely by autonomic mechanisms. Autonomic nervous system - Nomenclature. ... Including:

• Autonomic nervous system - Nomenclature
• Autonomic nervous system - Function
• Autonomic nervous system - Individual components
• Autonomic nervous system - The Cranial Sympathetics
• Autonomic nervous system - Connections with the Spinal Nerves
• Autonomic nervous system - Development

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The word sympathetic means different things in different contexts. In neurology, the sympathetic nervous system is a part of the autonomic nervous system. In music theory, sympathetic strings are strings on a musical instrument that resonate on their own. In psychology, sympathy is a feeling of compassion or identification with another. Other related archivesautonomic nervous system, music theory, musical instrument, neurology, psychology, resonate, sympa

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An autonomic ganglion is a collection of neuron cell bodies within the autonomic nervous system. Autonomic ganglion - Sympathetic ganglia. Ganglia of the sympathetic nervous system deliver information to the body about stress and impending danger, and evokes the familiar fight-or-flight response when activated. Autonomic ganglion - Sympathetic chain ganglia. The sympathetic chain ganglia are located just anterior to the spinal cord. Preganglionic nerves from the central n ... Including:

• Autonomic ganglion - Sympathetic ganglia
• Autonomic ganglion - Sympathetic chain ganglia
• Autonomic ganglion - Collateral ganglia
• Autonomic ganglion - Parasympathetic ganglia
• Autonomic ganglion - Terminal ganglia

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Ganglia of the sympathetic nervous system deliver information to the body about stress and impending danger, and evokes the familiar fight-or-flight response when activated. Autonomic ganglion - Sympathetic chain ganglia. The sympathetic chain ganglia are located just anterior to the spinal cord. Preganglionic nerves from the central nervous system synapse at one of the chain ganglia and the postganglionic fiber extends to an effector, typically a visceral organ in the thoracic cavity. ...

Read more here: » Autonomic ganglion: Encyclopedia II - Autonomic ganglion - Sympathetic ganglia

The mechanism of mydriasis depends on the agent being used. It will usually involve either a disruption of the parasympathetic nerve supply to the eye (which causes contraction of the pupil), or over-activity of the sympathetic nervous system (SNS). Atropine blocks muscarinic acetylcholine receptors. Acetylcholine (ACh) is the neurotransmitter of the parasympathetic nervous system and blocking its a ...

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