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.
The ear surgeon can anesthetize the edges of the eardrum with a strong solution of Xylocaine or inject the ear canal skin with xylocaine. Xylocaine will anesthetize on contact. Once the eardrum is anesthetized, the undersurface can be scratched with a sharp right angled hook.