240 Medical Terminology: Mastering the Basics Key Term Defi nition cornea transparent outer layer of the eye that covers the iris and pupil and allows light to enter external auditory meatus external (outer) ear internal ear inner ear iris colored portion of the anterior eye lens structure of the eye that focuses light onto the retina middle ear central cavity of the ear optic nerve nerve that carries impulses for the sense of sight from the retina to the brain (Continued) Semicircular canals Cochlea Ossicles External (outer) ear Middle ear (tympanic cavity) Internal (inner) ear Eustachian tube Tympanic membrane (eardrum) Auricle (pinna) Auditory canal (external acoustic meatus) Figure 6.2 Major structures of the ear
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