Lecture 31b

Question 1

2 parts of external ear

Answer 1

auricle (pinna) and external acoustic meatus

Question 2

parts of auricle

Answer 2

helix, antihelix, concha, tragus, antitragus, lobule

Question 3

outer portion of the external acoustic meatus is cartilaginous and secretes a waxy material called

Answer 3

cerumen

Question 4

the middle ear consists of 3 bones called

Answer 4

ossicles

Question 5

roof of the middle ear

Answer 5

tegmen tympani

Question 6

the space directly internal to the tympanic membrane is called the

Answer 6

tympanic cavity

Question 7

space directly above tympanic membrane is called the

Answer 7

epitympanic recess

Question 8

eardrum

Answer 8

tympanic membrane

Question 9

when center of tympanic membrane becomes indrawn, it creates the

Answer 9

umbo (point)

Question 10

medial wall of middle ear is formed by

Answer 10

promontory, created by the base of the cochlea

Question 11

2 openings associated with the promontory

Answer 11

fenestra vestibuli and fenestra cochlea

Question 12

oval window, receives footplate of the most medial of the 3 ossicles (the stapes)

Answer 12

fenestra vestibuli

Question 13

round window, closed by a membrane

Answer 13

fenestra cochlea

Question 14

opening to mastoid antrum

Answer 14

aditus ad antrum

Question 15

projection that originates at the stapedius

Answer 15

pyramidal eminence

Question 16

the auditory ossicles

Answer 16

malleus (most lateral), uncus (intermediate), and stapes (most medial)

Question 17

organs of internal ear

Answer 17

cochlear duct (hearing), semicircular ducts, utricle and saccule (balance and position)

Question 18

fluid of the membranous labyrinth

Answer 18

endolymph

Question 19

3 parts of body labyrinth

Answer 19

cochlea (contains cochlear duct), vestibule (contains utricle and saccule), semicircle canals (contain semicircular ducts)

Question 20

space between bony and membranous labyrinth contains a fluid called

Answer 20

perilymph

Question 21

center of the cochlea is called the

Answer 21

cupula

Question 22

inside the cochlea, there is a bony shelf called the

Answer 22

osseous spinal lamina

Question 23

middle portion of the bony labyrinth

Answer 23

vestibule

Question 24

point where semicircular canals join the vestibule

Answer 24

ampulla

Question 25

has neural sensory endings which convert the mechanical energy of vibrating fluid to electrical energy

Answer 25

membranous labyrinth

Question 26

cochlear duct is modified in the

Answer 26

vestibular (Reissner’s) membrane and basilar membrane

Question 27

basilar membrane is further modified into the

Answer 27

spiral organ of Corti

Question 28

stimulation of fibers from the __ allows turning the head, endolymph flow over sensory endings (allows kinetic equilibrium)

Answer 28

ampullary crest

Question 29

hearing summary

Answer 29

tympanic membrane vibrates ossicles, stapes vibrates perilymph, which conveys vibrations to endolymph, stimulation of auditory endings that project to CN 8