Retropharyngeal is the medical term meaning behind the pharynx.
The pharynx is the area at the back of the throat where the mouth (nasal cavity) and nasal cavity meet. The portion behind the nose is the nasopharynx, and the portion behind the mouth is the oropharynx.
The oropharynx is the portion of the pharynx behind the mouth, or oral cavity.
nasopharynx is posterior to the nasal cavity
The cardiac sphincter connects the esophagus to the stomach.
Posterior simply means the back side or behind, which is the opposite of anterior, which is the front side.
cervix
rectum
The axis is the medical term meaning the longitudinal or long portion of a structure. The Axis of the uterus points up and down (cephalocaudally).
Air from the nasal cavity enters the superior portion of the pharynx called the nasopharynx.
The Oropharynx
Gastrostenesis
outer ear