Ear

Question 0

what does the organ of corti contain?

Answer 0

the receptors for the auditory apparatus

Question 1

what makes up the inner ear?

Answer 1

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

Question 2

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

Answer 2

malleous
stapes
incus

Question 3

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

Answer 3

transmit sound from the tympanic membrane to the middle ear

Question 4

what are the 2 muscles associated with the middle ear?

Answer 4

stapedius

tensor tympani

Question 5

what does the stapedius do?

Answer 5

tightens the annular ligament

reduces osciltatory range

Question 6

what is the innervation of the stapedius?

Answer 6

the facial nerve

Question 7

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

Answer 7

a lesion of the facial nerve

Question 8

what innervates the tensor tympani?

Answer 8

the auriculotemporal branch of Viii

Question 9

what is the function of the tensor tympani?

Answer 9

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

Question 10

where does the Eustachian tube connect?

Answer 10

the pharynx and the middle ear

Question 11

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

Answer 11

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

Question 12

what is the arterial supply of the Eustachian tube?

Answer 12

middle menangial artery
ascending pharyngeal artery
artery of the pterygoid canal

Question 13

what is the venous drainage of the Eustachian tube?

Answer 13

the pterygoid venous plexus

Question 14

what is the nerve supply of the Eustachian tube?

Answer 14

tympanic plexus
pterygoid plexus
glossopharyngeal nerve

Question 15

what is the lymph drainage in the Eustachian tube?

Answer 15

the deep cervical lymph nodes

Question 16

what is the function of the Eustachian tube?

Answer 16

to equalise pressure between the nasopharynx and middle ear

Question 17

what are the borders of the tympanic cavity?

Answer 17

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

Question 18

what are the contents of the middle ear?

Answer 18

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

Question 19

describe the tympanic membrane

Answer 19

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

Question 20

describe the external acoustic meatus

Answer 20

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

Question 21

what is the innervation of the external acoustic meatus?

Answer 21

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

Question 22

describe the sensory innervation of the auricle

Answer 22

greater auricular nerve

auriculotemporal nerve anterior to the external acoustic meatus

Question 23

lymph drainage of the external ear

Answer 23

deep cervical
superficial cervical
mastoid
superficial parotid

Question 24

what is the arterial supply of external ear

Answer 24

posterior auricular

superficial temporal

Question 25

what is the auricle made from?

Answer 25

cartilage

Question 26

what happens if there is a haematoma within the auricle?

Answer 26

loss of blood supply to cartilage

if undrained, builds up and turns into fibrous tissue causing cauliflower ears