Pyloric Sphincter
Pyloric Sphincter - Related Videos
01:11
Pyloric Obstruction
0 Views •
2026
Pyloric obstruction, also referred to as gastric outlet obstruction, is a condition characterized by narrowing or blockage at the pylorus—the muscular valve regulating the flow of stomach contents into the duodenum. When this passage becomes impaired, the stomach cannot effectively empty its contents into the small intestine. This disruption leads to a range of gastrointestinal symptoms, including early satiety, bloating, epigastric pain, postprandial nausea, persistent vomiting, and...
03:25
Transcorporal Artificial Urinary Sphincter Cuff Placement in a Case Requiring Revision for Urethral Atrophy
0 Views •
Cited by 2 •
2022
Here we describe the application of transcorporal artificial urethral sphincter (AUS) placement in a case requiring revision of an artificial urinary sphincter for urethral atrophy.
06:04
Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
0 Views •
Cited by 41 •
2016
This protocol describes the use of excised intestinal tissue preparations or "intestinal sacs" as an ex vivo model of intestinal barrier function. This model may be used to assess integrity of both the epithelial barrier and the mucous gel layer at specific intestinal sites in animal models of digestive disease.
10:07
Cystometric and External Urethral Sphincter Measurements in Awake Rats with Implanted Catheter and Electrodes Allowing for Repeated Measurements
0 Views •
Cited by 10 •
2018
This protocol first describes the surgical procedure of the permanent implantation of a urinary bladder catheter combined with external urethral sphincter electrodes, and second, the measurement of the function of the urinary bladder and external urethral sphincter in implanted awake animals.
06:02
Isolation of Lymphocytes from a Mouse Peyer's Patch
0 Views •
2025
In this video, we demonstrate the isolation of lymphocytes from a harvested mouse Peyer's patch. The isolated lymphocytes can be used for further analysis.
FAQs
These features of stomach contents provide signals that adjust muscle tone and rhythmic contractions. Changes in acidity, nutrient composition, or volume can alter how readily chyme enters the duodenum, allowing gastric emptying to respond to the condition of the material being delivered. This regulation helps match stomach output with the intestine’s capacity for neutralization and nutrient processing.
Rhythmic contractions make passage intermittent rather than continuous. Small releases of chyme give the duodenum time to receive and process incoming material, while sphincter tone limits movement in the opposite direction. The resulting pattern links gastric activity with intestinal handling, so digestion proceeds as a coordinated sequence instead of as an unrestricted flow.
Its behavior depends on both baseline muscle tone and changing rhythmic contractions. Rather than acting as a permanently open or closed gate, the sphincter adjusts passage in response to stomach contents and local digestive conditions. This dynamic control explains how release can remain selective while still adapting to differences in acidity, nutrients, and volume.
The sphincter coordinates two linked stages of digestion by controlling when partially digested material leaves the stomach. Delayed, limited delivery gives the duodenum an opportunity to neutralize stomach acid and begin processing nutrients. Its activity therefore connects gastric digestion with intestinal absorption, making it an important example of coordinated gastrointestinal motility.
It demonstrates how smooth muscle activity, chemical features of digestive contents, and movement through the gastrointestinal tract interact. Because its tone and rhythmic contractions regulate transfer between two digestive regions, the sphincter provides a focused system for examining how motility coordinates digestion. Biology and medicine can use this relationship to understand normal gastrointestinal function.
Changes in opening or narrowing can disrupt the controlled transfer of chyme between the stomach and duodenum. If passage is not appropriately regulated, coordination between gastric emptying, acid neutralization, and intestinal nutrient processing may be disturbed. For this reason, abnormal sphincter behavior is relevant to digestive disorders and to medical study of gastrointestinal motility.