Anatomy of paranasal sinuses

Question 1

What are paranasal sinuses?

Answer 1

Air-filled spaces that are extensions of the nasla cavity

Question 2

How many paranasal sinuses are there?

Answer 2

Four pairs

Question 3

What are the four pairs of paransal sinuses? How are they named?

Answer 3

Frontal

Ethmoid

Sphenoid

Maxillary

named according to which bone they are in

Question 4

What lines the paranasal sinsues?

Answer 4

Respiratory mucous membrane

Question 5

What are the functions of the paransal sinuses?

Answer 5

Complement the functions of the nasal cavity

Reduce weight of skull

Question 6

What do the paranasal sinuses drain into?

Answer 6

Meatuses of nasal cavity

mostly middle meatus

Question 7

What connects the paranasal sinuses to the meatuses of the nasal cavity?

Answer 7

Ostia, which are small channels

Question 8

What are the important anatomical relations of the paranasal sinuses?

Answer 8

Nasal cavity

Orbital cavity, particularly ethmoid and maxillary sinuses

Anterior cranial fossa, particularly frontal and ethmoid sinuses

Question 9

What nerves do sensory innervation of the paranasal sinuses?

Answer 9

Frontal, ethmoid and sphenoid sinuses by the opthalmic branch of the CN5 trigeminal nerve

Maxillary sinus by the maxillary branch of the CN5 trigeminal nerve