Definition

1. Noun:
   • The valve between the distal end of the esophagus and the stomach; the physiological sphincter at the esophagogastric junction: The cardiac sphincter is a muscular ring that controls the passage of food and liquid from the esophagus into the stomach and prevents stomach contents from flowing back up.

Usage Examples

• Noun:
  • A properly functioning cardiac sphincter prevents acid reflux.
  • The doctor explained that the weakness in his cardiac sphincter was causing heartburn.
  • During swallowing, the cardiac sphincter relaxes to allow food to enter the stomach.

Advanced Usage

• Clinical Context: In medical terminology, "cardiac sphincter" is often used interchangeably with "lower esophageal sphincter (LES)" or "gastroesophageal sphincter," though there can be subtle anatomical distinctions noted in specialized literature.
  • The study focused on the pressure dynamics of the cardiac sphincter.

Variants and Related Words

• Lower Esophageal Sphincter (LES) (n): The more common clinical term for the cardiac sphincter.
• Gastroesophageal Sphincter (n): Another synonym emphasizing the junction between the esophagus and stomach.
• Sphincter (n): The general term for a circular muscle that constricts a passage or orifice.

Synonyms

• Lower esophageal sphincter (LES)
• Gastroesophageal sphincter

Notes on Meaning

• The term "cardiac" in "cardiac sphincter" refers to its proximity to the part of the stomach closest to the heart (the cardia), not to the heart muscle itself. It is a physiological sphincter, meaning its function is achieved through muscular coordination rather than being a distinct, thickened anatomical band of muscle.

Noun

1. the valve between the distal end of the esophagus and the stomach; the physiological sphincter at the esophagogastric junction