Nasal cavity

Question 1

what divides the nose into right and left halves ?

Answer 1

the septum

Question 2

what is the framework of the external nose made up by?

Answer 2

nasal bone , frontal process of the maxilla , and nasal part of the frontal bone . below , the framework is formed by plates of hyaline cartilage

Question 3

what is responsible for the blood supply of the external nose ‘?

Answer 3

• branches of ophthalmic artery and maxillary artery

- ala and lower part of the septum are supplied by facial artery

Question 4

what is responsible for the nerve supply of the external nose?

Answer 4

• infra-trochlear and external nasal branches of the ophthalmic nerve
• infra-orbital branch of the maxillary nerve

Question 5

from where does the nasal cavity extend ?

Answer 5

from the nostrils to the posterior nasal apeonurosis

Question 6

where does the nasal cavity open ?

Answer 6

nasopharynx

Question 7

what is the vestibule ?

Answer 7

the area of the nasal cavity lying just inside the nostrils

Question 8

what is the septum made up of ?

Answer 8

septal cartilage , ther vertical plate of the ethmoid and the vomer

Question 9

what is the roof of the nasal cavity formed by ?

Answer 9

sloping anterior part :

• nasal spine of frontal bone
• nasal bones

horizontal middle part:
- plate of ethmoid bone

sloping posterior part :

• ala of vomer
• (anterior surface )body of sphenoid bone
• process of palatine bone

Question 10

what is the floor of the nasal cavity made up of ?

Answer 10

upper surface of the hard palate

1. ) palatine process of the maxilla
2. )horizontal plate of the palatine bone

Question 11

what is the medial wall of the nasal cavity composed of ?

Answer 11

septal nasal cartilage anteriorly

and perpendicular plate of ethmoid + vomer posteriorly

Question 12

what is the lateral wall of the nasal cavity composed of ?

Answer 12

1. ) vestibule (contains hairs called vibrissae)
2. ) atrium
3. ) posterior part which contains 3 chonchae and 3 meatuses and one rectus

Question 13

list the meatuses and recess present in the medial surface of the nasal cavity

Answer 13

inferior meatus
superior meatus
middle meatus

sphenoethmoidal recess

Question 14

what are the structures escaping each meatus / recess?

Answer 14

inferior meatus : nasolacrimal duct

middle meatus :

• maxilary sinus
• frontal sinus
• anterior ethmoid sinus

superior meatus :
-posterior ethmoid sinus

sphenoethmoid recess : sphenoid sinus

Question 15

what is the blood supply of the nasal septum and what is this area called?

Answer 15

littles area/ kiesselbach’s area:

• anterior ethmoidal
• sphenopalatine
• greater palatine
• labial branch of facial artery

Question 16

what nerves are responsible for special sensory supply and general sensory supply in the nasal cavity ?

Answer 16

general sensory nerve :trigeminal nerve

special sensory nerve :olfactory nerve