ring

A circular band or hoop; a structure surrounding a circular opening, abdominal r. The external or internal abdominal r., especially the former. Bandl's r. Syn.: contraction r. A r.- shaped muscular thickening of the uterus during labor, pointed out by Bandl as constituting the boundary between the contractile portion of the organ and the thinned and flabby portion below, and constituting, in his opinion, the true os uteri internum, benzene r. The benzene nucleus, CeHe, found in many organic chemical compounds, contraction r. Of Schroder. See Bandl's r. crural r. See femoral r. deep abdominal r. See internal abdominal r. diaphragmatic r. The opening in the diaphragm for the pa age of the vena cava. external abdominal (or inguinal) r. The external aperture of the inguinal canal, femoral r. An oval opening with its longest diameter transverse, forming the abdominal opening of the femoral canal. inguinal r. See abdominal r. internal abdominal (or inguinal) r. The inner aperture of the inguinal canal, an opening in the transversal is fascia about midway between the anterior superior spine of the ilium and about y2 inch A above Poupart's muscular sphincter like ligament. Miiller's r. situated r. at the point where the canal of the cervix uteri joins the cavity of the body of the uterus at an advanced stage of gestation, r. of