Flashcards in Hearing & Vestibular Sense Deck (31)
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1
Outer ear consists of:
Pinna (auricle)
External auditory canal
Tympanic membrane
2
Middle ear consists of:
The ossicles: malleus and staples
3
Inner ear consists of:
Bony labyrinth
4
Pinna function
Channels sound waves into the external auditory canal
5
External auditory canal directs:
The sound waves to the tympanic membrane (eardrum)
6
Louder sounds = _____ intensity
Greater
7
What separates the outer ear from the middle ear
Tympanic membrane
8
Ossicles
Found in the middle ear
Helps transmit and amplify the vibrations from the tympanic membrane to the inner ear
9
Malleus (hammer)
Attached to the tympanic membrane
Acts on the incus (anvil) which acts on the staples (stirrup)
10
Cochlea
Entrance to the inner ear
Staples rest on it
11
Ossicles is made up of 3 parts. What are they ?
Staples
Malleus
Incus
12
The middle ear is connected to the nasal cavity via what?
Eustachian tube
13
Eustachian tube function?
Helps equalize pressure between the middle ear and the environment
14
Bony labyrinth contains:
Cochlea
Vestibule
Semicircular canals
15
(3) parts an ear is divided into
Inner, middle and outer ear
16
What thin layer of fluid simultaneously transmits vibrations from the outside world and cushions the inner ear structures ?
Perilymph
17
Cochlea
Detects sound
Spiral shaped organ divided into 3 parts called Scalae
18
Organ of corti
Actual hearing apparatus
Contains thousands of hair cells bathed in endolymph
19
Basilar membrane
Thin flexible membrane under the organ of corti
20
Tectorial membrane
Immobile membrane on top of the organ of corti
21
Sound enters the cochlea through the oval window and causes vibrations in the Perilymph which are transmitted to which membrane ?
Basilar membrane
22
Round window
A membrane covered hole in the cochlea that permits the Perilymph to actually move within the cochlea
23
Hair cells on the organ of corti function ?
Converts the physical stimulus into an electrical signal which is carried to the CNS by the auditory (vestibulocochlear) nerve
24
Bony labyrinth is filled with
Perilymph
25
Utricle and saccule
Is in the vestibule that is a portion of the bony labyrinth
Detect linear acceleration
Contain modified hair cells covered with otoliths (which resist motion as the body accelerates)
26
Semicircular canals
Detect rotational acceleration
27
Auditory pathway
Cochlea ➡️ vestibulocochlear nerve and medial geniculate nucleus (MGN) ➡️ auditory cortex in the temporal lobe
28
Auditory group is found in what lobe?
Temporal
29
Superior olive
Localizes the sound
30
Inferior colliculus
Helps keep the eyes fixed on s point while the head is turned
Involved in the startle reflex
31
