List the four specific anatomical sub-sites that constitute the oropharynx as distinct from the oral cavity proper.

The oropharynx is the central portion of the pharynx, distinct from the oral cavity proper which lies anterior to it, and extends from the soft palate superiorly to the superior border of the epiglottis inferiorly. Its anterior boundary is formed by the palatoglossal arches. The four specific anatomical sub-sites that constitute the oropharynx are the base of the tongue, the palatine tonsils and tonsillar fossae, the soft palate including the uvula, and the posterior pharyngeal wall. The base of the tongue is the posterior one-third of the tongue, located behind the circumvallate papillae, and is distinguished from the anterior two-thirds which belong to the oral cavity proper. The palatine tonsils are lymphoid tissues located on each side of the oropharynx within specific depressions known as tonsillar fossae, which are situated between the palatoglossal and palatopharyngeal arches. The soft palate is the movable posterior part of the roof of the mouth, comprising muscle and connective tissue, and includes the uvula, a small fleshy projection at its free lower edge; it forms the superior boundary of the oropharynx. The posterior pharyngeal wall is the back wall of the throat, with its oropharyngeal component extending vertically from the level of the soft palate down to the level of the superior surface of the epiglottis.