a circular band of muscular fibers at the rectosigmoid junction. Synonym(s): O'Beirne sphincter, O'Beirne valve, pelvirectal sphincter
O'Bierne,
James, Irish surgeon, 1786-1862. O'Bierne sphincter - a circular band of muscular fibers at the rectosigmoid junction. Synonym(s): rectosigmoid sphincterO'Bierne tube