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Related Concept Videos

Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
Large Intestine01:09

Large Intestine

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.
The ileocecal sphincter, a mucous membrane fold, guards the opening from the ileum to the large intestine. This valve permits material from the small intestine to pass into the large intestine. Attached to the ileocecal valve is the cecum. This small pouch, approximately 6 cm long, has a twisted, coiled tube known as...
Feces Formation and Defecation01:26

Feces Formation and Defecation

After spending 3 to 10 hours in the large intestine, chyme loses a lot of water and becomes feces, the final product of digestion. Feces consist of undigested dietary fiber such as cellulose, mucus, sloughed-off epithelial cells, and microbes. The descending and sigmoid colon stores feces and uses haustral contractions to dry it out but retains enough water to give it a semi-solid texture.
The mass peristalsis then pushes the feces into the rectum, which stretches the rectal walls to activate...
Muscles of the Pelvic Floor and Perineum01:26

Muscles of the Pelvic Floor and Perineum

The muscles of the pelvic floor and perineum are crucial for supporting the pelvic organs, controlling continence, and aiding in sexual function, childbirth, and core stability. They are typically divided into the superficial perineal layer and the deep pelvic floor layer.
Perineal Layer
The perineum is a diamond-shaped area below the pelvic diaphragm, divided into an anterior urogenital triangle that contains the external genitals and a posterior anal triangle housing the anus. The urogenital...
Anatomy of the Genitourinary System II: Bladder and Urethra01:19

Anatomy of the Genitourinary System II: Bladder and Urethra

The lower urinary system consists of the urinary bladder and urethra, which are essential in storing and expelling urine from the body. Together with the internal and external sphincters, these structures work together to regulate urination effectively.Anatomy of the BladderThe urinary bladder is a muscular, stretchable organ behind the pubic bone and in front of the rectum. In females, the bladder is positioned anterior to the vagina and inferior to the uterus, while in males, it is located...
Anatomy of the Intestines01:23

Anatomy of the Intestines

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.
Small Intestines
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 small...

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In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats
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Anorectal anatomy and physiology.

Andrew Barleben1, Steven Mills

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Summary
This summary is machine-generated.

The rectum and anal canal are key to digestion and continence. Investigating their pathologies involves history, exams, and advanced imaging like ultrasound and MRI.

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Area of Science:

  • Gastroenterology and Colorectal Surgery

Background:

  • The rectum and anal canal are the terminal parts of the gastrointestinal tract.
  • Their normal function relies on complex neural, muscular, and environmental interactions for fecal storage and controlled defecation.
  • Pathologies can significantly impair these functions.

Purpose of the Study:

  • To outline the anatomical and functional significance of the rectum and anal canal.
  • To detail the diagnostic approaches for pathologies affecting these structures.

Main Methods:

  • Clinical evaluation including detailed history and physical examination.
  • Functional studies such as anorectal manometry, electromyography, and defecography.
  • Advanced imaging modalities including ultrasound and magnetic resonance imaging (MRI).

Main Results:

  • Pathologies affecting the rectum and anal canal compromise digestive and continence functions.
  • A combination of clinical assessment and specialized investigations is crucial for diagnosis.
  • Imaging techniques like ultrasound and MRI enhance the evaluation of these complex structures.

Conclusions:

  • Understanding the intricate physiology of the rectum and anal canal is vital for diagnosing and managing related disorders.
  • Multimodal diagnostic strategies, integrating functional tests and advanced imaging, are essential for comprehensive patient evaluation.