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Anatomy of the abdominal viscera: Innervation of the abdominal viscera
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All of these organs work involuntarily, so they’re innervated by the autonomic nervous system. And luckily so - can you imagine trying to voluntarily control digesting each vegetable in a salad?!
Functionally, the peripheral nervous system is also divided into two parts. The somatic nervous system controlling the voluntary movement of skeletal muscles, and the autonomic nervous system that controls the involuntary movement of the smooth muscles and also the glands of our organs or viscera.
The sympathetic nervous system is our fight or flight response and increases heart rate and breathing rate, while slowing down digestion through reducing peristalsis and constricting blood vessels to the gut to reduce blood flow.
The parasympathetic nervous system is our rest and digest response and it slows down heart rate, and increases digestion by promoting peristalsis, gland secretion, and dilation of gut vessels for increased blood flow.
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