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Somatic and Special Senses Anatomy Ch. 10 Part III Sense of Hearing Mr. Henderson- “Take your hat off in the hall.” student- (no response) Mr. Henderson- “Excuse me child, I said take your hat off in the hall!” Student- “Ok, ok, you don’t have to tell me twice, take it easy!” Ear has inner, middle and external parts External Ear 2 parts: 1. auricle-outer, funnel shaped structure 2. External auditory meatus- S shaped tube leading inwards thru temporal bone Fig. 10.7 Auricle collects sounds waves and directs them into the external auditory meatus Vibrating vocal cords produce voice http://videos.howstuffworks.com/hsw/12677breaking-the-silence-how-sound-reaches-ourears-video.htm Parts of the ear HowStuffWorks Videos "Exploring Sound: Parts of the Ear" Middle Ear Eardrum (tympanic membrane) Has skin on outer side, mucous membrane on inner side Cone-shaped Malleus (bone) is attached to it Don’t put Q-tips in ear to clean it out-could rupture eardrum! Nothing smaller than your finger should go in your ear. Auditory ossicles (bones): Fig 10.8 Malleus-vibrates with eardrum. Then the vibration is passed on to the incus, which passes it on to the stapes. These bones also amplify the sounds to the oval window. drums solo - Google Video Role of the Auditory Tube To equalize pressure on both sides of the eardrum Drains to throat Helps with altitude changes How the ear works TeacherTube - 1. How the ear works Inner Ear Fig. 10.9 Each ear has 2 labyrinths (osseous and membranous) Membranous is inside osseous 3 semicircular canals-provide equilibrium Cochlea-functions in hearing Inner ear anatomy You can detect sound wave frequencies from 20-20,000 or more vibrations per second. See Table 10.1, page 274 which sums up hearing something The Bat! They use echolocation to catch their prey HowStuffWorks Videos "Exploring Sound: Echo Location" Hearing-decibels Whispering: 40dB Normal conversation: 60-70 dB At 120 dB (a rock concert), produces discomfort At 140 dB, produces pain (jet takeoff) Frequent exposure above 90 can lead to hearing loss. What? Equilibrium Fig. 10.12 Static equilibrium-maintain stability and posture Dynamic equilibrium-moving or in motion, helps with balance Static equilibrium Organs utricle and saccule, inside membranous labyrinth (Fig. 10.9) Fig. 10.12 Dynamic Equilibrium cats funny - Google Video Johnson wins floor exercise for third gold AOL Video The 3 semicircular canals detect motion of the head and body and aid in balancing in sudden movement. Motion sickness Organs of equilibrium are disturbed