Nerv06/introduction/dual innervation by the sympathetic and parasympathetic nerves

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2015年5月5日 (火) 10:05時点におけるAdmin (トーク | 投稿記録)による版
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POINT!

The autonomic nervous system, which is a part of the peripheral nervous system, is functionally divided into the sympathetic and parasympathetic nervous systems. The sympathetic nervous system facilitates functions needed for exercise, and the parasympathetic nervous system facilitates functions needed for the gastrointestinal digestion and absorption, etc.

Auto somtic dual innervation.jpg

Each organ receives innervation from both systems (dual innervation) which have opposing effects (antagonistic innervation). For example, the heart activity (such as heart rate and output) is facilitated by the sympathetic nervous system, and inhibited by the parasympathetic nervous system. Meanwhile, activity of the gastrointestinal tract, ureter and bladder (such as contraction, mobility and secretion) are facilitated by the parasympathetic nervous system, and inhibited by the sympathetic nervous system.

Challenge Quiz

1.

Dual innervation and antagonistic innervation are characteristics of the somatic.autonomic nervous system.

2.

An internal organ basically receives innervation from both. one of the divisions of the autonomic nervous system, namely the sympathetic and parasympathetic nerves.