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Anatomy of the Intestines

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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the...
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The small intestine is primarily responsible for digestion and nutrient absorption. It spans from the pyloric sphincter to the ileocecal valve and connects to the large intestine.
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The large intestine is divided into three main regions: the cecum, colon, and rectum. Extending from the ileocecal valve to the anus, it frames the small intestine on three sides.
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COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Related Experiment Video

Updated: Feb 10, 2026

A Mouse Model of Intestinal Partial Obstruction
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Neonatal Intestinal Obstruction Syndrome.

Manuel Gil Vargas, Mariana L Miguel-Sardaneta, Michelle Rosas-Téllez

    Pediatric Annals
    |May 12, 2018
    PubMed
    Summary

    Neonatal intestinal obstruction, a failure in bowel movement due to anatomical issues, requires prompt pediatric surgery. Anorectal malformations are the leading cause in newborns.

    Area of Science:

    • Pediatric Surgery
    • Neonatal Medicine
    • Gastroenterology

    Background:

    • Neonatal intestinal obstruction is a common surgical emergency in newborns.
    • It stems from anatomical abnormalities hindering bowel movements.
    • Classic signs include vomiting, abdominal distention, and failure to pass meconium.

    Purpose of the Study:

    • To summarize the causes and clinical presentation of neonatal intestinal obstruction.
    • To highlight the prevalence of different congenital obstructions in neonates.

    Main Methods:

    • Review of existing literature on neonatal intestinal obstruction.
    • Analysis of common causes and their incidence.

    Main Results:

    • Anorectal malformations account for 41% of congenital digestive tract obstructions.

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  • Esophageal obstruction is observed in 24% of cases.
  • Duodenal obstruction represents 20% of congenital obstructions.

    • Conclusions:

    • Neonatal intestinal obstruction is a significant cause for pediatric surgical admissions.
    • Understanding the common causes like anorectal malformations is crucial for timely diagnosis and management.