the pharynx is a short vertical tube located in the head back of the buccal cavity.It provide passage into which the internal nares and buccal cavity both open 2 pass the air in2 it .
The pharnyx provide passage in2 trachea or wind pipe through a silt aperture called glottiss.Glottis always remain open accept during swalloing. The glottis bears a leaf like cartilaginous flap called epiglottis .
during swalling epiglottis closes the glottis to check the entry of food into it. entry of food in respiratory track can be fatal