<prompt> Lower limit of retropharyngeal space is at ?C 7Bifurcation of trachea4th esophageal constrictionNone  <response>: Ans. isbi.e., Bifurcation of tracheaRetropharyngeal space is divided into two lateral spaces space of gillette by a fibrous band.Retropharyngeal space is limited above by the base of skull and below where the alar fascia fuses with buccopharyngeal fascia at the level of T4 and carina bifurcation of trachea. 