part of part of Lagomorpha Rodentia muscle of neck sphincter colli superficialis muscle M. sphincter colli superficialis is present in Lagomorpha but absent in Rodentia (Meinertz, 1941, 1942; Ryan, 1989; Rinker, 1954). Some errouneous references of this muscle in rodents (e.g., Bezuidenhout and Evans, 2005) are due to decussating fibers of the deep sphincter, which creates a false superficial sphincter (Ryan, 1989) M. sphincter colli superficialis UBERON:0011508 The sphincter colli superficialis is composed of transverse muscle fibers, and covers the entire area between the lower jaw and chest. The muscle is used to tighten the skin on the underside of the throat. sphincter colli superficialis NCIT:C53016 EMAPA:37699 MA:0002380 sphincter colli muscle