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Defecation - Wikipedia, the free encyclopedia
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Defecation
From Wikipedia, the free encyclopedia
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Defecate)
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Not to be confused with
Deification (disambiguation).
For sugar processing, see
Sugarcane. For the death metal band, see
Defecation (band).
"Poopy Pants" redirects here. For the Captain Underpants villian, see
Pippy Poopypants.
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16th century drawing of a person defecating in
squatting position outside
Conscious and parasympathetic pathways of defecation reflex
Defecation (from late latin "Defecatio") is the final act of
digestion by which organisms eliminate solid, semisolid or liquid
waste material (
feces) from the
digestive tract via the
anus. Waves of
muscular contraction known as
peristalsis in the walls of the
colon move fecal matter through the digestive tract towards the
rectum. Undigested food may also be expelled this way; this process is called egestion.
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The defecation cycle
In the adult human, the process of defecation, or the defecation cycle, is normally a combination of both voluntary and involuntary processes. The defecation cycle is the interval of time between the completion of one defecation, and the completion of the following defecation. At the start of the cycle, the
rectum ampulla (anatomically also: ampulla recti) acts as a temporary storage facility for the unneeded material. As additional fecal material enters the rectum, the rectal walls expand. A sufficient increase in fecal material in the rectum causes stretch receptors from the
nervous system located in the rectal walls to trigger the contraction of rectal muscles, relaxation of the internal anal sphincter and an initial contraction of the skeletal muscle of the external sphincter. The relaxation of the internal anal sphincter causes a signal to be sent to the brain indicating an urge to defecate.
If this urge is not acted upon, the material in the rectum is often returned to the
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