The **Anus** is the external opening of the gastrointestinal (GI) tract where stool exits the body. It sits at the end of the rectum and is surrounded by muscles that help maintain continence. In clinical care, the Anus is assessed during evaluation of bowel habits, bleeding, pain, and continence. It is also a key landmark for anorectal exams, endoscopy of the distal rectum, and colorectal surgery planning.
The Rectum is the final segment of the large intestine, located just above the anal canal. It acts as a temporary storage site for stool before a bowel movement. Clinicians reference the Rectum during physical exams, endoscopy, imaging, and surgery. It is commonly discussed when evaluating bleeding, pain, changes in bowel habits, or continence.
Colon is the main portion of the large intestine. It sits between the small intestine and the rectum/anal canal. Its core roles include fluid absorption, stool formation, and housing gut microbiota. In clinical care, it is commonly discussed in relation to bowel habits, bleeding, inflammation, infection, and cancer screening.
The Large Intestine is the final major segment of the gastrointestinal (GI) tract. It absorbs water and electrolytes and forms and stores stool before defecation. It includes the colon and rectum and ends at the anal canal. Clinically, it is commonly referenced in colorectal cancer screening, inflammatory bowel disease evaluation, and workups for diarrhea or constipation.
The Small Intestine is the long, folded tube where most digestion and nutrient absorption occur. It sits between the stomach and the large intestine (colon). Clinicians discuss the Small Intestine when evaluating abdominal symptoms, anemia, malabsorption, and inflammatory disease. It is also a key focus in gastroenterology, hepatology, and gastrointestinal (GI) surgery teaching.
The Ileum is the final segment of the small intestine. It sits between the jejunum and the cecum (the first part of the large intestine). Its plain meaning is “the last small-bowel section,” where key absorption and immune functions occur. In clinical care, the Ileum is often referenced in inflammatory bowel disease, malabsorption, and endoscopy reports.
Jejunum is the middle segment of the small intestine. It sits between the duodenum and the ileum in the upper abdomen. Its main job is digestion and absorption of nutrients and water. In clinical practice, it is discussed in imaging, endoscopy, surgery, and nutrition support.
The Duodenum is the first part of the small intestine, immediately after the stomach. It is where acidic stomach contents mix with bile and pancreatic enzymes. Clinicians discuss the Duodenum when evaluating upper gastrointestinal (GI) symptoms, bleeding, and nutrient absorption problems. It is also a key landmark in endoscopy, imaging, and GI surgery.
The Stomach is a hollow muscular organ in the upper abdomen. It sits between the esophagus and the first part of the small intestine (the duodenum). It stores food, mixes it, and begins chemical digestion with acid and enzymes. In clinical medicine, it is commonly discussed when evaluating upper gastrointestinal symptoms and related diseases.
The Esophagus is a muscular tube that carries swallowed food and liquid from the throat to the stomach. It sits between the pharynx (throat) and the stomach and runs through the chest into the abdomen. In everyday terms, it is the “swallowing tube” that moves a bolus (a mouthful of food) downward. Clinically, it is discussed in reflux, swallowing problems, bleeding, and cancer evaluation.