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nouna ring of muscle that contracts to close an opening
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Definition that contains sphincter
- piles venous swelling external or internal to the anal sphincter
- hemorrhoid venous swelling external or internal to the anal sphincter
- haemorrhoid venous swelling external or internal to the anal sphincter
- physiological sphincter a sphincter that is not recognizable at autopsy because its resting arrangement cannot be distinguished from adjacent tissue
- cardiac sphincter the valve between the distal end of the esophagus and the stomach; the physiological sphincter at the esophagogastric junction
- pyloric valve the sphincter muscle of the pylorus that separates the stomach from the duodenum
- musculus sphincter pylori the sphincter muscle of the pylorus that separates the stomach from the duodenum
- tenesmus painful spasm of the anal sphincter along with an urgent desire to defecate without the significant production of feces; associated with irritable bowel syndrome
- pupillary reflex reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
- cardiospasm a spasm of the cardiac sphincter (between the esophagus and the stomach); if the cardiac sphincter does not relax during swallowing the passage of food into the stomach is obstructed