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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
- chyme a semiliquid mass of partially digested food that passes from the stomach through the pyloric sphincter into the duodenum
- miosis reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
- myosis reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller
- 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
- anal sphincter the sphincter muscle of the anus
- bladder sphincter the sphincter muscle of the urinary bladder; made up of a thickened muscular layer of bladder around the urethral opening
- cardiac sphincter the valve between the distal end of the esophagus and the stomach; the physiological sphincter at the esophagogastric junction