Paranasal Sinus Review Quiz and Flashcards

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Questions and Answers

What is the primary function of the paranasal sinuses?

Supporting the nasal bone structure

Filtering the inspired air

Warming and humidifying the inspired air (correct)

Regulating the body temperature

At birth, which sinus is not present?

Maxillary sinus

Sphenoidal sinus

Ethmoidal sinus

Frontal sinus (correct)

What is the purpose of the nasal cavity?

Supporting the skull structure

Regulating blood pressure

Olfactory function only

Breathing, warming, and moisturizing the air (correct)

What is the location of the maxillary sinus?

Inside the body of the maxilla Signup and view all the answers

What is the function of the nasal septum?

Dividing the nasal cavity into right and left halves Signup and view all the answers

What is another function of the paranasal sinuses?

Adding resonance to the voice Signup and view all the answers

What is the function of the superior meatus?

Receives the opening of the posterior ethmoidal air sinus Signup and view all the answers

How many nasal conchae are there?

Three Signup and view all the answers

What is the name of the artery that supplies blood to the nose?

Maxillary artery Signup and view all the answers

What is the function of the olfactory nerves?

Supply the olfactory area Signup and view all the answers

What is located in the spheno-ethmoidal recess?

The opening of the sphenoidal air sinus Signup and view all the answers

What nerve supplies the respiratory area?

Maxillary nerve Signup and view all the answers

Which part of the face do the two halves of the nasal cavity open through?

Anterior nares Signup and view all the answers

Which bone forms the posterior part of the roof of the nasal cavity?

Sphenoid bone Signup and view all the answers

What is the function of the nasal vibrissae found in the vestibule?

To trap dust particles Signup and view all the answers

Which bone forms the antero-inferior part of the medial wall of the nasal cavity?

Septal cartilage Signup and view all the answers

What is the name of the area of the nasal cavity that lies immediately above the nostril?

Vestibule Signup and view all the answers

How many areas does the lateral wall of the nasal cavity subdivide into?

Two Signup and view all the answers

Study Notes

Paranasal Sinuses

Definition: Air-filled spaces in certain bones surrounding the nasal cavity, opening into the lateral wall of the nose.
Functions: Warming and humidifying inspired air, diminishing skull weight, and adding voice resonance.

List of Paranasal Sinuses

Maxillary sinus: Inside the maxilla body.
Frontal sinus: Between the frontal bone plates (develops during the 2nd year of life).
Sphenoidal sinus: Inside the sphenoid bone.
Ethmoidal sinuses: Inside the ethmoidal labyrinth (anterior, middle, and posterior groups).

Nasal Cavity

Organ of breathing (cleans, warms, and moistens inspired air) and olfactory function.
Subdivided into right and left halves by the nasal septum.
Conchae: Bony plates covered with mucous membrane (superior, middle, and inferior nasal conchae).
Meatuses: Depressions below each concha (superior, middle, and inferior meatuses).
- Superior meatus: Receives posterior ethmoidal air sinus opening.
- Middle meatus: Receives openings of frontal, anterior and middle ethmoidal, and maxillary air sinuses.
- Inferior meatus: Receives nasolacrimal duct.

Spheno-ethmoidal Recess

Triangular fossa between the superior concha and nasal roof, receiving the sphenoidal air sinus opening.

Arterial Blood Supply of Nose

Maxillary artery (branch of the external carotid artery).

Nerve Supply of Nose

Olfactory area (1 cm): Olfactory nerves (roof and upper parts of both septum and lateral nasal walls).
Respiratory area: Maxillary nerve (part of trigeminal nerve).

Bony Skeleton of Nasal Cavity

Roof: Nasal process of frontal bone, nasal bone, cribriform plate of ethmoid bone, and body of sphenoid bone.
Floor: Palatine process of maxilla and palatine bone.
Nasal septum: Vomer, perpendicular plate of ethmoid bone, and septal cartilage.
Lateral wall: Vestibule (lined with skin containing hair) and area of nasal conchae and meatuses.

Openings in Lateral Wall of Nasal Cavity

Superior meatus: Posterior ethmoidal air sinus.
Middle meatus: Frontal, anterior and middle ethmoidal, and maxillary air sinuses.
Inferior meatus: Nasolacrimal duct.

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Description

This quiz covers the anatomy of paranasal sinuses, including their clinical importance, nasal cavity features, and supply systems. Students will be able to describe and list the paranasal sinuses and their functions.