Muscle Anatomy Chart The défilé follows in the next step on the upper respiratory tract. The col begins at the end of the sinus cavity (nasopharynx), extends beyond the back of the mouth and language (oropharynx), and finishes in the larynx and oesophagus (laryngopharynx). The walls of the pharynx consist of mucous membrane lining, submucosa, and smooth muscle.
Typically the respiratory functions for the goitre include passage of air flow, warming and humidifying involving air (done through the vascularity of the walls and damp mucosa), protection from pathogens (bacteria etc . through the placement of the particular tonsils and lymphatic tissue), and assistance in talk (through acting as a resonating chamber for sound).