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  • Defecation

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DefecationAka: Bowel Movement, Stool

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  1. See Also
    1. Constipation
    2. Diarrhea
  2. Physiology
    1. Stool propelled via colon to rectum
      1. Reaches cecum 4 hours after ingestion
      2. Reaches rectum 7-8 hours after ingestion
    2. Stool enters rectum
      1. Stool distends rectum
      2. Rectum contracts reflexively
      3. Stool forced into anal canal
      4. Stool crosses 90 degree angle
        1. Canal straightened with hip flexion (squatting)
    3. Stool enters anal canal
      1. Internal anal sphincter (involuntary control)
        1. Automatically relaxes on stool entrance
        2. Stretch receptors (S2-4) signal stool in anal canal
      2. External anal sphincter (voluntary control)
        1. Voluntary relaxation results in defecation
    4. Defecation
      1. External anal sphincter opens
      2. Intra-abdominal pressure increases with valsalva
      3. Stool moved out
    5. Results of chronically ignoring urge to defecate
      1. Sensory receptor reflex arc less responsive
      2. Stool collects in distal colon
      3. Rectosigmoid colon dilates
      4. Stool desiccates and worsens Constipation
  3. References
    1. Sartor in Dornbrand (1992) Ambulatory Care, p. 221-5
    2. Arce (2002) Am Fam Physician 65(11):2283

Defecation (C0011135)

Definition (MSH)The normal process of elimination of fecal material from the RECTUM.
Definition (GO)The expulsion of feces from the rectum. [GOC:mah]
Definition (NCI)The normal process of elimination of fecal material from the rectum.
ConceptsOrganism Function (T040)
MSHD003672
EnglishBowel action, Bowel function, Bowel habit, Bowel habits, Bowel motion - function, bowel movement, Bowel movements, Defaecation, Defecation, Defecations, Normal defecation, Passes stool completely
Spanishaccion intestinal, defecacion, defecacion normal, funcion intestinal, habitos intestinales, movimiento intestinal - funcion
Parent Conceptsrectal function (C0678871), Excretory function (C0221102), Digestive System Processes (C1720892), Gastrointestinal Process (C1517461), Toileting activity (C0150810), Large bowel function (C0232680), Bowel finding (C0426684), Does defecate (C0577098), Defecation observable (C1285902)
SourcesAOD, CSP, GO, LCH, MSH, NCI, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)


Fecal analysis procedure (C0202010)

Definition (CSP)examination of fecal matter for diagnostic purposes by chemical, physical, or microscopic means; includes performing chemical screening tests and screening for microorganisms or parasites.
ConceptsLaboratory Procedure (T059)
EnglishExamination of faeces, Examination of feces, Faecal analysis, Faeces analysis, Faeces examination - general, Fecal analysis, Fecal analysis procedure, Feces analysis, Feces examination - general, Stool, Stool = Fecal, Stool analysis, Stools
Spanishanalisis de excrementos, analisis de heces, analisis de materia fecal, examen de heces, examen fecal
Parent ConceptsChemistry, Clinical (C0008000), Microbiology procedure (C0085672), Chemical procedure (C0201682), Fecal analysis procedure (C0202010), Biochemical test (C0430027), Specimen description (C1294011), Duplicate concept (C1274013)
SourcesCSP, LNC, MTH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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