<prompt> Retropharyngeal space extends from the base of the skull toHyoid boneBifurcation of tracheaAngle of mandibleCricoid cailage  <response>: Retropharyngeal space: It lies behind the pharynx between the buccopharyngeal fascia covering pharyngeal constrictor muscles and the preveebral fascia.It extends from the base of the skull to the bifurcation of the trachea.Space is divided into two lateral compaments spaces of Gillette by a fibrous raphe.Each lateral space contains retropharyngeal nodes which usually disappear at3-4 years of age.Parapharyngeal space communicates with the retropharyngeal space.Infection of retropharyngeal space can pass down behind the esophagus into the mediastinum. 