posterior wall
Medical term referring to the back wall of an anatomical structure, such as the posterior wall of the stomach, pharynx, or vagina.
An ulcer was found on the posterior wall of the stomach.
Inflammation is observed on the posterior pharyngeal wall.
retropharyngeal abscess
Compound of 後 (こう, 'posterior') and 壁 (へき, 'wall'), a straightforward Sino-Japanese medical term.