Which of the following structures is not found in the mediastinum?

A. Epistaxis refers to nosebleed, which is unrelated to lung function or expansion.
B. Effusion refers to the accumulation of fluid (such as pleural effusion, where fluid collects in the pleural space around the lungs), not incomplete lung expansion.
C. Atelectasis is the collapse or incomplete expansion of a lung or part of a lung, which can occur due to blockage, pressure, or injury.
D. Adhesion refers to abnormal fibrous connections between tissues, which can occur in the body after injury or surgery, but it does not refer to incomplete lung expansion

A. The septum refers to the nasal septum, which divides the nasal cavity into two nostrils. It is not part of the pharynx.
B. The oropharynx is located below the nasopharynx and serves as a passage for both air and food. It is not the most superior portion of the pharynx.
C. The nasopharynx is the most superior portion of the pharynx, located behind the nasal cavity and above the soft palate. It is primarily involved in the passage of air from the nasal cavity to the rest of the respiratory system.
D. The laryngeal pharynx (or hypopharynx) is the portion of the pharynx below the oropharynx, just above the larynx, and it