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Anatomy > Ear > Flashcards

Flashcards in Ear Deck (45):
1

What is the pterion?

H-shaped suture on the lateral aspect of the skull

2

Which bone contains the organs of hearing and balance?

Temporal bone

3

Which structures does the petrous part of the temporal bone contain?

The organs of hearing and balance

The facial nerve (CN VII)

The vestibulocochlear nerve (CN VIII)

4

What forms the skeleton of the external ear?

Temporal bone and elastic cartilidge

5

What is the function of the external ear?

Collect and convey soundwaves to the tympanic membrane

6

What does the middle ear consist of?

Tympanic membrane to oval window

Includes the Eustachian tube

7

What is the function of the middle ear?

Amplifies and conducts sound waves to the internal ear

8

What is the function of the internal ear?

Converts special sensory information on sound/balance into fluid waves then into action potentials and conducts the action potentials towards the brainstem

9

What is the ear canal lined with?

Ceruminous glands that produce ear wax

10

Which bony structures are being indicated here?

Q image thumb

A image thumb
11

Which nerve gives general sensory supply to the inferior parts of the EAM and the tympanic membrane?

Vagus nerve

12

Which nerve gives general sensory nerve supply to the superior part of the EAM and most of the tympanic membrane?

CN V3

13

What is the general sensory nerve supply of most of the tympanic membrane?

CN V3 (mandibular nerve)

14

Which nerves supply general sensation to most of the auricle?

Spinal nerve C2, 3

15

What is the name of the group of pre-auricular lymph nodes?

Parotid nodes

16

What is the name of the group of post-auricular lymph nodes?

Mastoid nodes

(behind the ear)

17

Where do the parotid and the mastoid lymph nodes drain into?

Deep cervical chain lymph nodes

Lymphatic duct/thoracic duct

Venous angle

18

What is the umbo?

The most inwardly depressed part of the tympanic membrane

19

What is the pars flaccida?

The thin part of the tympanic membrane that lies superiorly

20

What is the pars tensa?

The thick part part of the tympanic membrane that lies posteroinferiorly

21

Which middle ear structure can be seen through the tympanic membrane here?

Q image thumb

Handle of the malleus

22

What is the structure being indicated here?

Q image thumb

Umbo

23

The opening into which tube is being shown here?

Q image thumb

Eustachian tube

24

What is the shared general sensory nerve supply to the eustachian tube, tonsils, middle ear cavity, nasopharynx and oropharynx?

CN IX

25

What is the eustachian tube?

A tube that connects the tympanic cavity to the lateral wall of the nasopharynx

26

Which cavities are being shown here?

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A image thumb
27

Which part of which middle ear bone inserts into the oval window?

Footplate/base of the stapes

28

What are the middle ear bones?

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Stapes

Incus

Malleus

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29

What kind of joints are between the middle ear bones?

Synovial joints

30

What is the promontry?

A bony swelling on the medial wall of the middle ear caused by the cochlea of the internal ear

31

What structure is being outlined here that lies deep to the bone?

Q image thumb

Facial canal

32

Where is this arrow pointing?

Q image thumb

Into the aditus

33

What can cause mastoiditis?

Spread of infection from the middle ear cavity via the aditus

34

What the smallest muscle in the body and what is it's function?

Stapedius

Reduces movement of the stapes to protect inner ear from excessive noise

35

Which ossicle is this?

Q image thumb

Incus

36

Which bone is this?

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Incus

37

Which bone is this?

Q image thumb

Malleus

38

Which nerve supplies the stapedius?

Facial nerve CN VII

39

What is the action of the tensor tympani muscle?

Pulls on the mandle of the malleus to tense the tympanic membrane

40

Which nerve supplies the tensor tympani?

CN V3

41

Which cranial nerve is the chorda tympani a branch of?

Facial nerve

42

What are the three parts of the bony labrinth?

Cochlea

Vestibule
Semicircular canals

43

What is the fluid that fills the bony labrinth?

Perilymph

44

Which structure can be found floating in the perilymph of the bony labrinth?

Membranous labrinth

45

What is the fluid that fills the membranous labrinth?

Endolymph