Peristalsis is the coordinated, wave-like contraction of smooth muscle that moves contents through hollow organs. In the gastrointestinal (GI) tract, it helps propel food, fluid, and gas from the esophagus to the rectum. Clinicians also use the term when describing motility (movement) patterns on imaging and physiologic testing.
Intrinsic Factor is a protein made by parietal cells in the stomach lining. It binds vitamin B12 and helps the body absorb it in the last part of the small intestine. It is commonly discussed in vitamin B12 deficiency, pernicious anemia, and gastric surgery. It also appears in laboratory testing as “Intrinsic Factor antibodies.”
Pepsin is a digestive enzyme that breaks down dietary proteins into smaller peptides. It is produced in the stomach, where the acidic environment helps it work effectively. In clinical medicine, Pepsin is discussed in relation to normal gastric digestion and reflux-related disease. It is also used as a laboratory reagent and appears in some digestive enzyme products.
Gastric Acid is the acidic fluid made by the stomach lining during digestion. It is mostly hydrochloric acid mixed with water, electrolytes, and enzymes. It helps break down food and supports normal nutrient absorption and host defense. In clinical medicine, it is discussed when evaluating symptoms like reflux, ulcers, and abnormal stomach function.
Gastric Mucosa is the innermost lining of the stomach. It contains the cells and glands that make acid, enzymes, mucus, and protective factors. It is commonly discussed in endoscopy reports, biopsy results, and pathology diagnoses. It is also a key concept for understanding gastritis, ulcers, and gastric cancer pathways.
The Gastric Antrum is the lower (distal) part of the stomach, just before the pylorus and small intestine. It helps mix, grind, and propel food toward the duodenum. Clinicians often reference it during upper endoscopy, imaging, and pathology reports. It is also a common site for gastritis, ulcers, and targeted biopsies.
The Body of Stomach is the central, largest portion of the stomach between the fundus and the antrum. It is a key site for acid production, enzyme secretion, and mechanical mixing of food. Clinicians reference the Body of Stomach in endoscopy reports, imaging interpretations, and surgical planning. It is also discussed in pathology when biopsies are taken for gastritis, infection, or cancer evaluation.
Fundus is an anatomy term that means the “bottom” or “far end” of a hollow organ. In gastroenterology, it most often refers to the upper part of the stomach. It is also used to describe the rounded far end of the gallbladder. Clinicians use Fundus as a location label in endoscopy, imaging, and surgery.
Cardia refers to the uppermost part of the stomach near where the esophagus enters. It is a transition zone between the esophageal lining and the gastric lining. In clinical practice, Cardia is used as an anatomic landmark when describing findings at the gastroesophageal junction. It is commonly mentioned in endoscopy reports, imaging interpretations, and surgical planning.
The **Pylorus** is the outlet region of the stomach where it meets the first part of the small intestine (the duodenum). It includes a muscular valve-like structure called the **pyloric sphincter**, which helps regulate stomach emptying. In clinical care, the Pylorus is discussed in disorders of nausea, vomiting, obstruction, and abnormal gastric motility. It is also a key landmark in endoscopy, imaging, and several gastrointestinal (GI) surgical procedures.