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Anatomy of the Ear

Anatomy of the Ear. Parts of the Ear. Is this your ear?. NOPE – This is the Ear!. There are three sections of the ear!. OUTER MIDDLE INNER. Outer Ear. Pinna -also known as the Auricle Ear Canal or External Auditory Canal. Middle Ear. Tympanic Membrane - Ear Drum Eustachian Tube

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Anatomy of the Ear

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  1. Anatomy of the Ear Parts of the Ear

  2. Is this your ear?

  3. NOPE – This is the Ear!

  4. There are three sections of the ear! • OUTER • MIDDLE • INNER

  5. Outer Ear • Pinna -also known as the Auricle • Ear Canal or External Auditory Canal

  6. Middle Ear • Tympanic Membrane - Ear Drum • Eustachian Tube • Three Bones known as the Ossicular Chain • Malleus • Incus • Stapes

  7. Inner Ear • Semicircular canals • Cochlea • Organ of Corti • 3 Chambers • 2 Membranes

  8. Review

  9. Anatomy of the Ear Functions of the Ear

  10. Outer Ear • Pinna -also known as the Auricle. • Made entirely of cartilage • Varies in size and shape • Gathers sound waves from the environment • Ear Canal • Lined with hair follicles to keep foreign objects out • Lined with skin-supporting glands • Sebaceous- secretes an oily, fatty substance is cerumen (also known as ear wax) • Cerumen exits ear naturally

  11. Middle Ear • Tympanic Membrane - Ear Drum • Must be protected, extremely thin • Keeps constant temperature and humidity • Vibrates when sound waves hit it • Eustachian Tube – Equalizer • 3 Primary Functions • Helps ventilate middle ear • Equalize pressure • Maintain proper drainage

  12. Middle Ear - The Ossicular Chain • Malleus • Incus • Stapes Purpose: helps transmit sound waves from the tympanic membrane to the inner ear

  13. Look Again.

  14. Inner Ear • Cochlea • Twisting bony shell • Diagrams show the inside • 3 to 5 rows of thousands of tiny hairs • Three Scala (or chambers) • ScalaVestibuli - oval window • Scala Media (cochlear duct) • Scala Tympani - round window

  15. Inside the Cochlea • “Organ of Corti – Also Known As: Organ of Hearing” • full length of Scala Media • resides on basilar membrane • lined with nerve endings come together to make 8th nerve (from here it gets really complicated so we will stop)

  16. Inside the Cochlea • Each chamber had different fluids that cannot mix – if these fluids cannot mix - will kill all nerves. • These fluids separated by membranes • Reissner’s Membrane • Basilar Membrane

  17. Semicircular canals • The canals sit at right angles to each other, are all attached. • They detect horizontal and vertical movement as well as acceleration.

  18. How the Ear Work! • https://www.youtube.com/watch?v=qgdqp-oPb1Q

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