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senses
ear
| Question | Answer |
|---|---|
| ear | responsible for hearing and equilibrium, or balance, Eighth cranial nerve connects these structures to the brain |
| anatomy of the ear | external, middle, inner ear |
| pinna | outer ear visible portion of the ear, funnels sound waves into auditory canal |
| tympanic membrane | produce ear wax, separates outer ear from middle ear and transmits sound vibrations into middle ear |
| Auditory canal | Slightly curved tube; carries sound waves from outer ear to tympanic |
| middle ear | contains three small bones are called malleus, incus, stapes malleus is connected to eardrum and connected to the incus which is connected to the stapes that transmit sound to the oval window |
| Conductive Hearing Loss | Temporary, Sound is not conducted efficiently through auditory canal to eardrum and middle ear. Hearing loss can be medically corrected. caused by obstruction such as earwax |
| Sensorineural Hearing Loss | Permanent, Caused by damaged cochlea or nerve pathways from inner ear to the brain. Hearing aids and cochlear implants helpful |
| Impacted Cerumen | Blocked or muffled hearing, Plugged feeling in ear, Pain |
| Otitis Media | middle ear infection. Swelling in the tissues surround the eustachian tube can cause closure. Caused by viral or bacterial infections often secondary to sore throats and colds |
| Otitis Externa (Swimmer’s Ear) | Infection or inflammation of the external auditory canal, |
| Otosclerosis | Hereditary condition, Abnormal tissue growth around stapes, Prevents stapes from transmitting sound vibrations to inner ear |
| Menière's Disease | Named after French physician Prosper Ménière, Affects balance and hearing. caused by Bacterial or viral infections Environmental factors |
| The Senses of Taste and Smell | Nose primary organ for the sense of smell. Olfactory cells of nasal cavity respond to changes in chemical concentrations |
| Taste buds | microscopic bumps on the tongue, roof of the mouth, walls of throat. Sweet, Sour, Salty, Bitter, Umami |
| The Sense of Touch | Oldest, most primitive sense, First sense humans experience in the womb, last one lost before death, Found over entire body |
| Special Senses and the Life Span | As a person ages, taste and smell receptors diminish. Receptors are most acute at birth but tend to begin to diminish around middle age. Other senses that diminish during aging include hearing (presbycusis) and vision (presbyopia) |