Nasal sinuses

Question 1

what are paranasal sinuses?

Answer 1

• air-filled cavities within the bones of the skull that are connected to the nasal cavity and lined with respiratory epithelium
• Immune role- IgA, IgM

Question 2

What are Anterior Paranasal sinuses?

Answer 2

• Frontal
• Maxillary
• Anterior Ethmoid sinuses

Question 3

What are Posterior Paranasal sinuses

Answer 3

• sphenoid
• posterior Ethmoid

Question 4

What is the sinus that is not present from birth?

Answer 4

Frontal sinus

Question 5

What are the functions of paranasal sinuses?

Answer 5

• humidifying and filtering inspired air,
• reducing the weight of the skull, and
• resonating the voice
• Immune role
• Aid in growth of facial skeleton

Question 6

Characteristics of frontal sinuse?

Answer 6

• start developing 2 or 3 years after birth.
• Lie between inner and outer tables of frontal bone.
• Right frontal air sinus is separated from the left by a septum

Question 7

Where the frontal sinus drains?

Answer 7

into anterior part of hiatus semilunaris of middle meatus through frontonasal duct

Question 8

the nerve supply of the frontal sinus?

Answer 8

Supraorbital nerve

Question 9

what are the bounduries of Frontal sinus?

Answer 9

• Anterior: superciliary arch of the forehead
• Posterior: Meninges and frontal lobe of brain.
• Inferior: Roof of nose.
  Roof of orbit (medial part).
  Ethmoidal air cells.

Question 10

What are the characteristics of the Maxillary sinus?

Answer 10

• Largest
• First to develop
• in body of the maxilla

Question 11

What is the shape of maxillary sinus?

Answer 11

• Pyramidal:
  Base
  Apex
  roof
  Floor
  Anterior
  Posterior

Question 12

The base of MS?

Answer 12

• Medial wall of the maxilla
• Lateral part of the nasal wall
• ostium of the sinus in The upper part

Question 13

Apex of the MS?

Answer 13

• Lateral- into the zygomatic process of the maxilla

Question 14

Roof of MS?

Answer 14

• floor of the orbit
• infara-orbital nerve

Question 15

Floor of MS?

Answer 15

• the alvoelar process of the maxilla

Question 16

The Posterior surface of the MS?

Answer 16

• Separates the sinus from infratemporal and pterygopalatine fossa
• the posterior superior alveolar nerves and vessels.

Question 17

The anterior surface of the MS?

Answer 17

• Canalis Sinuosus: anterior superior alveolar nerve

Question 18

The drainage of the maxillary sinus?

Answer 18

• n posterior part of hiatus semilunaris of middle meatus.

Question 19

Arterial supply of the maxillary sinus?

Answer 19

• maxillary artery: Anterior, Middle, Posterior, and superior alveolar artery.

Question 20

lymphatic drainage of the maxillary sinus

Answer 20

• Submandibular lymph nodes.

Question 21

the innervation of the MS?

Answer 21

trigeminal- Maxillary: Anterior, Middle, Posterior, superior alveolar nerve.

Question 22

Characteristics of ethmoid sinus?

Answer 22

• within labyrinth of ethmoid bone
• 3 groups: Anterior, Middle, and posterior

Question 23

drainagr of Ethmoidal siuns?

Answer 23

• Anterior group: middle part of hiatus seminularis of middle meatus.
• Middle group: bulla ethmoidalis of middle meatus.
• Posterior group: posterior part of superior meatus.

Question 24

Characteristics of the sphenoid sinus?

Answer 24

• 2 (right and left): bony septum
• within the body of sphenoid bone.
  Separated from each other by a bony septum.

Question 25

structures related to the sphenoid sinus?

Answer 25

the optic nerves,
internal carotid arteries,
pituitary gland
cavernous sinuses.

Question 26

Relation to orbit?

Answer 26

• Frontal air sinus- above.
• Ethmoidal air sinuses- medial.
• Maxillary air sinus- below.
• Sphenoidal air sinus- behind.