Anatomy - Nasal Cavities and Paranasal Sinuses Flashcards Preview

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Flashcards in Anatomy - Nasal Cavities and Paranasal Sinuses Deck (42)
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1

Which bones comprise the bony part of the nasal septum?

  1. Perpendicular plate of the ethmoid bone
  2. Vomer

(also small contributions from palatine bone and maxilla)

2

Which conchae are associated with the ethmoid?

Superior and middle

(inferior is a separate bone)

3

What contributes to the roof of the nasal cavities?

Cribriform plate and crista galli of the ethmoid

4

The lateral walls of the nasal cavities are formed from what?

Superior and middle conchae

5

Which Le Fort fractures may disrupt the ethmoid bone?

II and III

6

What is the danger of disrupting the ethmoid bone in a Le Fort fracture?

Infection can spread from nasal and paranasal sinuses into anterior cranial fossa

7

Which types of epithelium can be found in the nasal cavities?

  1. Keratinised stratified squamous epithelium (at nostrils)
  2. Respiratory epithelium
  3. Olfactory mucosa

8

What are the two key properties of respiratory epithelium?

  1. Ciliated
  2. Secreted mucous

9

What are the two main functions of mucous production by the respiratory epithelium?

  1. Traps pathogens
  2. Warms/humidifies air

10

Where do respiratory cells from the olfactor nerve pass into the nasal cavity?

Cribriform plate of the ethmoid

11

Where do the olfactory tracts end?

Temporal lobe

12

What provides the sensory supply to the nasal cavity?

Trigeminal nerve

  • Opthalmic division (V1) - anterosuperior aspect
  • Maxillary division (V2) - posteroinferior aspect

13

Where does the blood supply for the nasal cavities originate?

External and internal carotid arteries

14

Which arteries directly supply the face and nasal cavities?

  1. Facial (from external carotid)
  2. Maxillary (from external carotid)
  3. Ophthalmic (from internal carotid)

15

Which arteries does the ophthalmic artery contribute to the nasal cavity blood supply?

Anterior and posterior ethmoidal arteries

16

Which arteries does the maxillary artery contribute to the nasal cavity blood supply?

Sphenopalatine and greater palatine arteries

17

Which arteries does the facial artery contribute to the nasal cavity blood supply?

Lateral nasal branch of facial artery

or

Septal branch of superior labial artery

18

What is the name given to the arterial anastomosis found on the nasal septum?

Kiesselbach's (Little's) area

19

What makes Kiesselbach's area a point to note?

It is a very common site of epistaxis

20

What is the term given to the spaces below each of the conchae?

Meatuses

21

How many meatuses can be found in the nasal cavity?

3

(superior, middle and inferior)

22

What is the purpoe of the nasal conchae?

  1. Create turbulent air flow for better gas exchange
  2. Creates a larger surface area for respiratory epithelium to function

23

What will drain into the meatuses?

Paranasal sinuses

24

What are paranasal sinuses?

Air-filled spaces in bone

25

Name all of the different paranasal sinuses

  1. 2 x Ethmoid air cells
  2. 2 x Frontal bone sinuses (separated by bony septum)
  3. 2 x Maxillary sinuses
  4. 2 x Spenoidal sinuses

26

What does mucous drain from into the nasal cavities?

Ostia

(in lateral walls of the nasal cavities)

27

Where does the frontal sinus drain?

Middle meatus

28

Where do the ethmoid air cells drain?

Superior and middle meatuses

29

Where does the sphenoidal sinus drain?

Sphenoethmoidal recess

30

Where does the maxillary sinus drain?

Middle meatus