Ear

Question 1

External Ear parts

Answer 1

Auricle, external acoustic canal, Tympanic membrane

Question 2

Auricle

Answer 2

• elastic
• collects sound
• helix
• tragus and antitragus
• lobe (fibrous, skin, BV, fat)

Question 3

External Acoustic Canal

Answer 3

• elastic and bony
• conducts sound
• ceruminous gland: makes cerumen

Question 4

Tympanic Membrane

Answer 4

• ext: skin/int: mucous
• transmits sound to middle ear
• separates ext ear and middle ear

Question 5

Parts of TM

Answer 5

• Flaccid: thin and superior
• Tense: majority of membrane w/fibers to support
• Umbo: depressed joint

Question 6

Parts of Middle Ear

Answer 6

• Muscles of TM
• Auditory ossicles
• Chorda Tympani
• Eustachian Tube
• Windows (oval and round)

Question 7

Muscles of TM

Answer 7

• Tensory Tympani m

- Stapedius Tympani m

Question 8

Tensory Tympani m

Answer 8

pulls on the malleus –> tensing the TM –> reduces amplification (less damage)

Question 9

Stapedius Tympani m

Answer 9

pulls on the stapes to reduce vibrations

Question 10

Auditory ossicles

Answer 10

mallues –> incus –> stapes

Question 11

Chorda Tympani

Answer 11

• CN VII
• taste to anterior 2/3
• runs between the malleus and incus
• joins w/ the lingual n (CN V3)

Question 12

Windows

Answer 12

• oval: connected to stapes and superior opening

- round: inferior opening and secondary TM

Question 13

Parts of Inner Ear

Answer 13

• Bony labyrinth

- Membranous labyrinth

Question 14

Parts of Bony Labryrinth

Answer 14

• Cochlea: connected to the round window
• Vestibule: in between the cochlea and semiciruclar canals
• Semiciruclar Canals: ant, post, lateral canals; communicates with the vestibule

Question 15

Parts of Membranous Labryrinth

Answer 15

• Cochlea: Organ of Corti/Spiral Organ; hearing the receptors (directly related to hearing)
• Vestibular: Utricle an Saccule; balance
• Semicircular Canal: Ampulla w/ Crista ampullaris; rotation of head