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Flashcards in Ear Deck (27):
0

what makes up the inner ear?

in the petrous part of the temporal bone
contains a membranous and a bony part
series of canals that interconnect
vestibular and cochlear, with cochlear ducts

1

what does the organ of corti contain?

the receptors for the auditory apparatus

2

what are the 3 bones that are contained within the middle ear?

malleous
stapes
incus

3

what is the function of the malleus, incus and stapes?

transmit sound from the tympanic membrane to the middle ear

4

what are the 2 muscles associated with the middle ear?

stapedius
tensor tympani

5

what does the stapedius do?

tightens the annular ligament
reduces osciltatory range

6

what is the innervation of the stapedius?

the facial nerve

7

what can an infection of the middle ear lead to in terms of nervous problems?

a lesion of the facial nerve

8

what innervates the tensor tympani?

the auriculotemporal branch of Viii

9

what is the function of the tensor tympani?

it functions to pull the tympanic membrane to dull the transmission of sound

10

where does the Eustachian tube connect?

the pharynx and the middle ear

11

what is the significance of the Eustachian tube in a child?

it is straighter, therefore more prone to middle ear infections as the respiratory infection can back up the tube

12

what is the arterial supply of the Eustachian tube?

middle menangial artery
ascending pharyngeal artery
artery of the pterygoid canal

13

what is the venous drainage of the Eustachian tube?

the pterygoid venous plexus

14

what is the nerve supply of the Eustachian tube?

tympanic plexus
pterygoid plexus
glossopharyngeal nerve

15

what is the lymph drainage in the Eustachian tube?

the deep cervical lymph nodes

16

what is the function of the Eustachian tube?

to equalise pressure between the nasopharynx and middle ear

17

what are the borders of the tympanic cavity?

anterior - carotid border
posterior - mastoid
floor - jugular
roof - tegmen tympani bone
lateral - tympanic membrane
medial - the inner ear

18

what are the contents of the middle ear?

the tympanic membrane
the 3 bones
the auditory tube
resp epithelium
mastoid air cells
chorda tympani nerve
tympanic plexus nerve

19

describe the tympanic membrane

it is 1cm
3 layers - skin, fibrous and mucous membrane with resp epithelium
seperates middle and outer ear
connects to the malleus
external - auriculotemporal nerve, internal auricular branch of vagus

20

describe the external acoustic meatus

2-3cm long
sigmoid
1/3 cartilaginous with skin from external covering
2/3 bony
hairs all way along
contains cerumen and sebaceous glands

21

what is the innervation of the external acoustic meatus?

the lesser occipital nerve
the auriculotemporal branch of v
auricular branch of vagus
facial nerve

22

describe the sensory innervation of the auricle

greater auricular nerve
auriculotemporal nerve anterior to the external acoustic meatus

23

lymph drainage of the external ear

deep cervical
superficial cervical
mastoid
superficial parotid

24

what is the arterial supply of external ear

posterior auricular
superficial temporal

25

what is the auricle made from?

cartilage

26

what happens if there is a haematoma within the auricle?

loss of blood supply to cartilage
if undrained, builds up and turns into fibrous tissue causing cauliflower ears