Hiatus Oesophageus – Anatomy and Clinical Relevance
The hiatus oesophageus is the opening in the diaphragm through which the esophagus passes from the chest into the abdomen. It plays a key role in the development of hiatal hernias.
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The hiatus oesophageus is the opening in the diaphragm through which the esophagus passes from the chest into the abdomen. It plays a key role in the development of hiatal hernias.
What is the Hiatus Oesophageus?
The hiatus oesophageus (also called the esophageal hiatus) is an anatomical opening in the diaphragm – the large respiratory muscle that separates the thoracic cavity from the abdominal cavity. Through this opening, the esophagus passes from the chest down into the abdomen, where it connects to the stomach. In addition to the esophagus, branches of the vagus nerve also pass through this hiatus. The hiatus oesophageus is located at the level of the tenth thoracic vertebra (T10) and is surrounded by muscular fibers of the diaphragm that help regulate the passage.
Anatomy and Function
The opening is formed by the diaphragmatic crura – muscular pillars known as the crura diaphragmatis – which wrap around the esophagus and create a dynamic sphincter-like mechanism. This mechanism works in concert with the lower esophageal sphincter (a ring of muscle at the lower end of the esophagus) to form an effective anti-reflux barrier, preventing gastric contents from flowing back up into the esophagus.
- The hiatus oesophageus is located in the midline of the diaphragm, slightly to the left.
- It allows the passage of food and liquids from the mouth to the stomach.
- The surrounding muscle fibers help maintain the stomach contents within the abdominal cavity.
Clinical Relevance: Hiatal Hernia
When the hiatus oesophageus becomes enlarged or the surrounding muscles weaken, a hiatal hernia can develop. This occurs when part of the stomach protrudes upward through the hiatus into the chest cavity. There are two main types:
Sliding Hiatal Hernia (Axial Hernia)
This is the most common type. The gastroesophageal junction slides upward through the hiatus into the thoracic cavity. This weakens the anti-reflux barrier and often leads to gastroesophageal reflux disease (GERD) – the backflow of stomach acid into the esophagus.
Paraesophageal Hiatal Hernia
In this less common type, a portion of the stomach herniates through the hiatus alongside the esophagus, while the gastroesophageal junction remains in its normal position. This type can lead to serious complications such as gastric volvulus or incarceration and often requires surgical intervention.
Symptoms Associated with Disorders of the Hiatus Oesophageus
Many individuals with a hiatal hernia experience no symptoms at all. When symptoms do occur, they may include:
- Heartburn and acid regurgitation
- Chest pain or a sensation of pressure behind the sternum
- Difficulty swallowing (dysphagia)
- Nausea and a feeling of fullness
- Chronic cough or hoarseness due to irritation of the airways
Diagnosis
Abnormalities involving the hiatus oesophageus are assessed using several diagnostic tools:
- Upper endoscopy (esophagogastroduodenoscopy, EGD): Direct visualization of the mucosa and the esophagogastric junction.
- Barium swallow (contrast radiography): Imaging of the anatomical relationships and any displacement of structures.
- pH-metry and manometry: Measurement of acid levels in the esophagus and pressure in the sphincter region.
- Computed tomography (CT): Used when complex hernias or complications are suspected.
Treatment
Treatment depends on the type and severity of symptoms:
Conservative Measures
- Weight loss in overweight individuals
- Dietary modifications (avoiding fatty, acidic, or heavily spiced foods)
- Elevating the head of the bed during sleep
- Avoiding alcohol and tobacco
Medication
- Proton pump inhibitors (PPIs) such as omeprazole or pantoprazole reduce gastric acid production and relieve reflux symptoms.
- H2-receptor antagonists as an alternative acid-suppressing therapy
- Antacids for short-term neutralization of stomach acid
Surgical Treatment
For large hernias, persistent symptoms, or complications, a laparoscopic fundoplication – a minimally invasive procedure in which the upper portion of the stomach is wrapped around the lower esophagus – can restore the anti-reflux barrier and narrow the esophageal hiatus.
References
- Vakil N. et al. – The Montreal Definition and Classification of Gastroesophageal Reflux Disease. American Journal of Gastroenterology, 2006; 101(8):1900–1920.
- Kahle W., Frotscher M. – Pocket Atlas of Anatomy, Vol. 2: Internal Organs. Thieme, 12th edition, 2018.
- Katz P.O. et al. – ACG Clinical Guideline: Diagnosis and Management of Gastroesophageal Reflux Disease. American Journal of Gastroenterology, 2022; 117(1):27–56.
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Related search terms: Hiatus oesophageus + Hiatus oesophagus + Hiatus oesophagei + Esophageal hiatus