sphincter; constrictor muscle
Anatomical term for a ring-like muscle that closes a bodily passage or opening. Often used in compound names such as 肛門括約筋 (anal sphincter).
The anal sphincter is important for controlling bowel movements.
食道と胃の間には下部食道括約筋があります。
There is a lower esophageal sphincter between the esophagus and the stomach.
sphincter muscle of urinary bladder