an accumulation of muscular circular fibers or specially arranged oblique fibers the function of which is to reduce partially or totally the lumen of a tube, the orifice of an organ, or the cavity of a viscus; the closing component of a pylorus.
Health4All
an accumulation of muscular circular fibers or specially arranged oblique fibers the function of which is to reduce partially or totally the lumen of a tube, the orifice of an organ, or the cavity of a viscus; the closing component of a pylorus.