3: Anatomy 2 - ear Flashcards Preview

ENT Week 1 2017/18 > 3: Anatomy 2 - ear > Flashcards

Flashcards in 3: Anatomy 2 - ear Deck (100)
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1

Which bone protects the organs of hearing and balance?

Temporal bone

2

What kind of nerve fibres innervate the ear?

Special sensory nerves

3

Which cranial nerves are most responsible for hearing and balance?

CN VII (Facial nerve)

CN VIII (Vestibulocochlear nerve)

4

What is the pterion?

Intersection of the

FRONTAL, PARIETAL, TEMPORAL and SPHENOID sutures

also the thinnest part of the skull

5

What is the thinnest part of the skull and which bone is it found on?

Pterion

Temporal bone

6

What is the lower part of the temporal bone called and why?

Petrous part

harder than the upper part

7

What part of the temporal bone forms the outer opening of the ear?

External acoustic meatus

8

What is the pointy projection at the lower part of the temporal bone which can be palpated behind the ear?

Mastoid process

9

What is the thin projection from the temporal bone which acts as the insertion for some muscles of the tongue and pharynx?

Styloid process

10

Which process attaches the temporal bone to the zygomatic bone?

Zygomatic process

11

What are the three important processes of the temporal bone?

Mastoid process

Styloid process

Zygomatic process

12

Which bone forms the hard palate?

Palatine bone

13

Which bones make up the floor of the anterior cranial fossa?

Frontal, ethmoid and sphenoid bones

14

Which bones make the floor of the middle cranial fossa?

Sphenoid and temporal bones

15

Which bones make up the floor of the posterior cranial fossa?

Temporal and occipital bones

16

Do the parietal bones make up the floors of any cranial fossa?

No (found on the walls)

17

Where does CN I exit the cranial cavity?

Cribriform plate

18

Where does CN II exit the cranial cavity?

Optic canal

19

Where do CN III, IV, V1 and VI exit the cranial cavity?

Superior orbital fissure

20

Where does CN V2 exit the cranial cavity?

Foramen rotundum

21

Where does CN V3 exit the cranial cavity?

Foramen ovale

22

Where do CN VII and VIII exit the cranial cavity?

Internal acoustic meatus

23

Where do CN IX, X and XI exit the cranial cavity?

Jugular foramen

(so does the internal jugular vein)

24

Where does CN XII exit the cranial cavity?

Hypoglossal canal

25

What are the three general parts of the ear

External ear

Middle ear

Internal ear

26

The external ear goes from the ___ to the ___ ___.

auricle

tympanic membrane

27

What joins the auricle to the external tympanic membrane?

External acoustic meatus

28

What is the purpose of the external ear?

Collects sound waves and conveys them to tympanic membrane

29

The middle ear goes from the ___ ___ to the ___ ___.

tympanic membrane

oval window

30

Apart from the tympanic membrane, ossicles and oval window, what other important structure is found in the middle ear?

Eustachian tube