In this image of a preserved frog, the lower jaw and tongue have been removed to
reveal the details of the upper surface of the oral cavity. Frogs are predators
that capture prey (usually insects) with sticky tongues that are attached
at the front, an arrangement that allows them to be everted to some distance.
Prey are held by a two rows of tiny, sharp maxillary teeth (1) located on each
side of the upper jaw as well as a pair of more centrally located, larger
vomerine teeth (2).
Frogs breath by taking in air through a pair of external nares that enter the
oral cavity through openings called internal nares (3). Note the openings to the
eustachian tubes (4) that communicate with the middle ear cavity. These
structures allow vertebrates to equalize the pressure on both sides of the