<P> The middle ear is the portion of the ear internal to the eardrum , and external to the oval window of the inner ear . The mammalian middle ear contains three ossicles , which transfer the vibrations of the eardrum into waves in the fluid and membranes of the inner ear . The hollow space of the middle ear is also known as the tympanic cavity and is surrounded by the tympani bone . The auditory tube ( also known as the Eustachian tube or the pharyngotympanic tube ) joins the tympanic cavity with the nasal cavity ( nasopharynx ) , allowing pressure to equalize between the middle ear and throat . </P>
<P> The middle ear is the portion of the ear internal to the eardrum , and external to the oval window of the inner ear . The mammalian middle ear contains three ossicles , which transfer the vibrations of the eardrum into waves in the fluid and membranes of the inner ear . The hollow space of the middle ear is also known as the tympanic cavity and is surrounded by the tympani bone . The auditory tube ( also known as the Eustachian tube or the pharyngotympanic tube ) joins the tympanic cavity with the nasal cavity ( nasopharynx ) , allowing pressure to equalize between the middle ear and throat . </P>
the auditory canal is formed out of which bone of the skull
the auditory canal is formed out of which bone of the skull
tympani bone
tympani bone