Special Senses Hearing and Equilibrium

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Presentation transcript:

Special Senses Hearing and Equilibrium Hearing: a response to vibrating air molecules Equilibrium: the sense of motion, body orientation, and balance

Structures of the Ear semicircular canals labyrinth vestibule ossicles pinna cochlea vestibulocochlear nerve external auditory meatus tympanic membrane eustachian tube outer ear inner ear middle ear Word Bank: cochlea, eustachian tube, external auditory meatus, inner ear, labyrinth, middle ear, ossicles, outer ear, pinna, semicircular canals, tympanic membrane, vestibule, vestibulocochlear nerve

Organ of hearing? Ear >Inner ear > Cochlea > Organ of Corti

Type of receptor? Mechanoreceptor

Type of receptor? Mechanoreceptor

Nerve pathway?

Interpretation? Temporal lobe

Difficulty Hearing? Overactive ceruminous glands Unexpected visitor

Sense of Equilibrium Try it: Stand on one foot. Close your eyes and stand on one foot. How is balance affected when sight is eliminated? What organs must we be using? Eye Ear > Inner Ear > Vestibule and Semicircular Canals Receptors used? Mechanoreceptor Photoreceptor

Hair cells in vestibule are stimulated by changes in space. Static Equilibrium (Position in Space) Hair cells in vestibule are stimulated by changes in space.  

Dynamic Equilibrium (Perception of motion) -linear (driving forward) -angular (turning the corner) Movement causes hair cells in semicircular canal to bend.

Nerve pathways Try It! Hold the anatomy book in front of you in a comfortable reading distance. Fix your gaze on the middle of the page. Move the book left and right about once per second. Now hold the book still and shake your head from side to side at the same rate. Nerves for eye movement are important in the sense of equilibrium.

Interpretation? Parietal lobe Cerebellum Spinal cord

Motion Sickness Motion Sickness is a contradiction of senses. Which senses? Watch video

Video https://www.youtube.com/watch?v=Ie2j7GpC4JU

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