Anatomy - Clinical Anatomy of the Ear Flashcards Preview

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Flashcards in Anatomy - Clinical Anatomy of the Ear Deck (56)
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1

What is the thinnest part of the skull?

Pterion

2

Why is a fracture at the pterion very dangerous?

The middle meningeal artery is located behind it

Trauma to this artery can cause an epidural haematoma

3

The temporal bone is comprised of which two parts?

Squamous and petrous

4

The zygomatic process is associated with which bone?

Temporal

5

Which bones form the anterior cranial fossa?

  1. Frontal
  2. Ethmoid
  3. Sphenoid

6

Which bones form the middle cranial fossa?

  1. Sphenoid
  2. Temporal

7

Which bones form the posterior cranial fossa?

  1. Temporal
  2. Occipital

8

Which cranial nerve(s) enter the cranial cavity via the anterior cranial fossa?

Olfactory nerve

(via cribriform plate of the ethmoid bone)

9

Which cranial nerves enter the cranial cavity in the middle cranial fossa?

  1. CN II
  2. CN III
  3. CN IV
  4. CN V (V1, V2 and V3)
  5. CN VI

10

CN VII enters the cranial cavity via which orifice?

Internal acoustic meatus

(in posterior cranial fossa)

11

CN V2 enters the cranial cavity via which orifice?

Foramen rotundum

12

Which cranial nerve(s) enter the cranial cavity via the superior orbital fissure?

  1. CN III
  2. CN IV
  3. CN V1
  4. CN VI

13

CN V3 enters the cranial cavity via which orifice?

Foramen ovale

14

Which cranial nerves enter the cranial cavity in the posterior cranial fossa?

  1. CN VII
  2. CN VIII
  3. CN IX
  4. CN X
  5. CN XI
  6. CN XII

15

Which cranial nerve(s) enter the cranial cavity via the internal acoustic meatus?

  1. CN VII
  2. CN VIII

16

Which cranial nerve(s) enter the cranial cavity via the jugular foramen?

  1. CN IX
  2. CN X
  3. CN XI

17

Which cranial nerve(s) enter the cranial cavity via the hypoglossal foramen?

CN XII

18

By which term is the eardrum referred to?

Tympanic membrane

19

Which areas can lymphatics from the ear drain firstly based on their location in the auricle?

  1. Lateral surface of superior half - Parotid lymph nodes
  2. Cranial surface of superior half - Mastoid lymph nodes and deep cervical
  3. Rest of auricle and lobe - Superficial cervical lymph nodes

20

All lymphatic drainage from the auricle will eventually follow which path?

  1. Deep cervical lymph nodes
  2. Thoracic duct or right lymphatic duct
  3. Venous angle

 

21

What is the name given to the thinnest aspect of the tympanic membrane?

Pars flaccida

22

What is the name given to the thickest part of the tympanic membrane?

Pars tensa

23

What is the name given to the most inwardly depressed area of the tympanic membrane?

Umbo

24

What supplies general sensory supply to the external surface of the tympanic membrane?

CN V3

25

What supplies general sensory supply to the internal surface of the tympanic membrane?

CN IX

26

What are the bones which can be found in the middle ear?

  1. Malleus
  2. Incus
  3. Stapes

27

What creates the umbo?

Handle of malleus ataches at this point pulling in the tympanic membrane

28

What is the name of the opening to the internal ear?

Oval window

29

Why can tonsillitis or pharyngitis minic ear ache?

They have a shared sensory supply (CN IX)

This is referred pain

30

What connects the middle ear cavity to the nasopharynx?

Eustachian tube