Chara (alga) Chara is a genus of charophyte green algae in the family Characeae. They are multicellular and superficially resemble land plants because of stem-like and leaf-like structures. They are found in fresh water, particularly in limestone areas throughout the northern temperate zone, where they grow submerged, attached to the muddy bottom.
The eustachian tube (also known as the auditory tube or the pharyngotympanic tube) joins the tympanic cavity with the nasal cavity (nasopharynx), allowing pressure to equalize between the middle ear and throat.
âââââââââââââââââââââââââââââââââââââââââââââââThe eardrum is a small membrane at the end of the ear canal. These sound waves vibrate the eardrum; the sounds are then transmitted to the bones of hearing (ossicles). The eardrum also protects the middle ear so debris and bacteria do not enter the middle ear.here are many ways an eardrum perforation can occur. An infection behind the eardrum in the middle ear may cause a rupture of the eardrum. Trauma to the ear may result from an object entering the ear canal and puncturing the eardrum.