| A | B |
|---|
| structures composing the outer ear | pinna(auricle),external auditory canal, tympanic membrane |
| the ossicles | stapes, malleus, incus |
| incus | anvil |
| stapes | stirrup |
| malleus | hammer |
| one of the ear structures not used in hearing | vestibule |
| vibrates as sound waves hit it; transmits the vibrations to the ossicles | tympanic membrane |
| tympanic membrane | ear drum |
| connects the nasopharynx and the middle ear | auditory tube |
| otiliths | tiny stones made of calcium salts |
| endolymph | fluid in the inner ear |
| myopia | nearsightedness |
| hyperopia | farsightedness, inability to focus on close objects |
| strabismus | eyes do not line up in the same direction |
| emmetropia | normal vision |
| photopupillary reflex | reflex-constriction of pupils when they are exposed to bright light |
| cataract | clouding of the lens, resulting in loss of sight |
| inability to see well in the dark | night blindness |
| Vitamin A | vitamin involved in the ability to see in the dark |
| aqueous humor | fluid that provides nutrients to the lens and cornea |
| tapetum lucidum | iridescent part of the choroid in the cow, not in humans |
| optic disc(blind spot) | area of the retina that lacks photoreceptors |
| the "white" of the eye, the tough outer covering | sclera |
| gel-like substance that helps to reinforce the eyeball | vitreous humor |
| ciliary body | contains muscle that controls the shape of the lens |
| pupil | opening through which light passes |
| iris | pigmented tunic surrounding the pupil |
| retina | contains photoreceptors for vision |
| lens | this structure changes shape to focus light on the retina |
| cones | responsible for color vision |
