MCQ IN MEDICINE

Detailed explanation-1: -Regionally, the pharynx divides into three parts which are from superior to inferior:-the nasal pharynx, located behind the posterior nasal apertures (choanae), the oral pharynx, located behind the opening of the oral cavity, and the laryngeal pharynx, located behind the inlet (opening) of the larynx.

Detailed explanation-2: -The walls of nasopharynx, oropharynx, and laryngopharynx are composed of four layers. From internal (luminal side) to external, the layers are the mucosa, submucosa, muscle layer, and fibrosa.

Detailed explanation-3: -The pharynx extends from the skull base to the cricoid cartilage and can be divided into three parts: the nasopharynx, oropharynx, and laryngopharynx. The pharynx is a cylindrical tube made up of skeletal muscle, fascia, and mucosa, that transports air to the laryngeal inlet and food to the digestive inlet.