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    Related Topics

    From Digestive System

    Splenic Flexure
    Bend between transverse and descending colon.
    Abdominal Cavity
    The abdominal cavity is the largest body cavity, housing vital digestive and excretory organs, lined by the peritoneum and essential for protection, metabolism, and organ movement.
    Ileum
    Final and longest portion of the small intestine.
    Cheeks
    Lateral walls of the oral cavity composed of muscle and fat.
    Palatine Tonsils
    Lymphatic tissues on either side of the oropharynx.
    Ileocecal Valve
    Controls flow from ileum to cecum.
    Anal Canal
    Terminal part of the large intestine.
    Lips
    Fleshy borders of the mouth that aid in speech and food intake.
    Hard Palate
    Bony anterior portion of the roof of the mouth.
    Left Lobe
    Smaller lobe of the liver.
    Caudate Lobe
    Lobe of liver near inferior vena cava.
    Esophagus
    Muscular tube conveying food from the pharynx to the stomach.
    Ligamentum Venosum
    Remnant of ductus venosus in liver.
    Abdomen
    The abdomen is the body region between the chest and pelvis housing vital digestive, metabolic, and excretory organs, protected by muscular and peritoneal layers.
    Rugae of Stomach
    Internal folds allowing expansion of the stomach.
    External Anal Sphincter
    Voluntary muscle around anus.
    Body of Pancreas
    Central elongated portion of pancreas.
    Uvula
    Dangling soft tissue at the back of the soft palate.
    Tail of Pancreas
    Tapered end of pancreas near spleen.
    Pancreas
    Gland with both endocrine and exocrine functions.
    Hepatic Flexure
    Bend between ascending and transverse colon.
    Sublingual Glands
    Salivary glands beneath the tongue.
    Common Bile Duct
    Conveys bile from liver and gallbladder to duodenum.
    Nasopharynx
    Superior region of pharynx behind the nasal cavity.
    Accessory Pancreatic Duct
    Secondary duct emptying into duodenum.

    Fundus

    Reviewed by our medical team

    Upper curved portion of the stomach.

    Overview

    The fundus is the uppermost, dome-shaped portion of the stomach. It lies superior to the opening between the esophagus and stomach and primarily functions as a storage area for ingested food and gases. Though not directly involved in mechanical digestion, the fundus plays an essential role in gastric accommodation, acid secretion, and regulating intragastric pressure.

    Location

    The fundus is located in the left upper quadrant of the abdomen, specifically:

    • Superior to the cardia of the stomach (where the esophagus enters)

    • Just below the left dome of the diaphragm

    • Posterior to the left lobe of the liver and anterior to the spleen

    On imaging or anatomical dissection, the fundus typically contains a visible gas bubble in upright individuals.

    Structure

    The fundus shares the general histological structure of the rest of the stomach, with specific features including:

    • Mucosa: Lined with simple columnar epithelium; contains tightly packed gastric glands rich in parietal and chief cells

    • Submucosa: Composed of connective tissue, blood vessels, and nerves

    • Muscularis externa: Includes inner oblique, middle circular, and outer longitudinal muscle layers for gastric motility

    • Serosa: The outermost layer, made of visceral peritoneum

    The fundic mucosa is specialized for acid and enzyme secretion.

    Function

    The fundus performs several key digestive-related functions:

    • Storage: Temporarily stores swallowed food and liquids before they move into the body and antrum of the stomach

    • Secretion: Contains gastric glands that secrete hydrochloric acid (HCl) and pepsinogen for the breakdown of proteins

    • Gas reservoir: Collects swallowed air, which can later be released through belching

    Physiological Role(s)

    The fundus contributes to several important physiological functions in the gastrointestinal system:

    • Gastric accommodation: Smooth muscle in the fundus relaxes reflexively after food enters the stomach (receptive relaxation), allowing it to expand without increasing pressure

    • Parietal cell activity: Parietal cells in the fundic glands secrete HCl, which lowers gastric pH, activates enzymes, and helps kill ingested pathogens

    • Hormonal regulation: Contributes to secretion of hormones such as ghrelin (a hunger-stimulating hormone)

    • Initial digestion: Begins enzymatic digestion of proteins using pepsin and maintains the acidic environment needed for effective gastric function

    Clinical Significance

    Several clinical conditions and considerations are associated with the fundus:

    • Gastric fundus varices: Dilated veins in the fundus can occur due to splenic vein thrombosis or portal hypertension, increasing the risk of upper gastrointestinal bleeding

    • Fundic gland polyps: Usually benign and often associated with prolonged use of proton pump inhibitors (PPIs) or familial polyposis syndromes

    • Gastric cancer: Though less common in the fundus than in the antrum, adenocarcinoma may arise in this region and present with vague upper abdominal symptoms

    • Hiatal hernia: In some cases, the fundus herniates through the diaphragm into the thoracic cavity, potentially causing gastroesophageal reflux disease (GERD)

    • Barrett’s esophagus proximity: Fundal acid production can contribute to lower esophageal exposure in reflux conditions, increasing cancer risk

    Endoscopic evaluation and upper GI imaging (such as barium studies or CT) are commonly used to assess the fundus in cases of suspected pathology.

    Did you know? Your digestive system works continuously, even when you are not eating, by processing food and waste.