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Questions and Answers
What is the only externally visible part of the respiratory system?
What is the only externally visible part of the respiratory system?
What is the anatomical term for the external openings of the nose?
What is the anatomical term for the external openings of the nose?
What structure bounds each nostril laterally?
What structure bounds each nostril laterally?
What anatomical structure is found centrally between the nostrils?
What anatomical structure is found centrally between the nostrils?
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How is the nose attached to the forehead?
How is the nose attached to the forehead?
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Which of these structures is part of the nasal framework formed above?
Which of these structures is part of the nasal framework formed above?
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Which part of the nasal cavity contains the nasal septum?
Which part of the nasal cavity contains the nasal septum?
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Which type of cartilage forms the lower part of the nose?
Which type of cartilage forms the lower part of the nose?
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The nasal cavity extends from the external (anterior) nares to what structure?
The nasal cavity extends from the external (anterior) nares to what structure?
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Which bone is part of the nasal framework formed above?
Which bone is part of the nasal framework formed above?
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How many horizontal bony projections are present in the lateral wall?
How many horizontal bony projections are present in the lateral wall?
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Which membranes cover the bony projections in the lateral wall?
Which membranes cover the bony projections in the lateral wall?
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What are the names of the conchae present in the lateral wall?
What are the names of the conchae present in the lateral wall?
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Another term for conchae is:
Another term for conchae is:
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What is the primary characteristic of the projections in the lateral wall?
What is the primary characteristic of the projections in the lateral wall?
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Which function of the nasal cavity helps in producing vocal sounds?
Which function of the nasal cavity helps in producing vocal sounds?
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What type of tissue is found in the upper part of the nasal cavity and aids in the sense of smell?
What type of tissue is found in the upper part of the nasal cavity and aids in the sense of smell?
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Which of the following is NOT a function of the paranasal sinuses?
Which of the following is NOT a function of the paranasal sinuses?
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Which bones contain the paranasal sinuses?
Which bones contain the paranasal sinuses?
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What is the primary role of the cilia within the paranasal sinuses?
What is the primary role of the cilia within the paranasal sinuses?
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Which anatomical feature is essential for the nose's role in facial appearance?
Which anatomical feature is essential for the nose's role in facial appearance?
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Which structure forms the floor of the nasal cavity?
Which structure forms the floor of the nasal cavity?
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Which of the following bones contributes to the roof of the nasal cavity?
Which of the following bones contributes to the roof of the nasal cavity?
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What forms the posterior part of the medial wall (nasal septum) of the nasal cavity?
What forms the posterior part of the medial wall (nasal septum) of the nasal cavity?
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Which part of the nasal cavity is formed superiorly by the vertical plate of the ethmoid bone?
Which part of the nasal cavity is formed superiorly by the vertical plate of the ethmoid bone?
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What structure is NOT part of the roof of the nasal cavity?
What structure is NOT part of the roof of the nasal cavity?
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Which of the following imaging methods is considered the most accurate for detecting if the sinuses are obstructed?
Which of the following imaging methods is considered the most accurate for detecting if the sinuses are obstructed?
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Where are the maxillary sinuses located?
Where are the maxillary sinuses located?
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Which type of sinuses are found within the frontal bone?
Which type of sinuses are found within the frontal bone?
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Which statement about CT scanning is NOT true?
Which statement about CT scanning is NOT true?
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Which of the sinuses are located in the ethmoid bone?
Which of the sinuses are located in the ethmoid bone?
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What structure separates the nasal cavity from the cranial cavity?
What structure separates the nasal cavity from the cranial cavity?
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Which sinus is situated behind the cribriform plate?
Which sinus is situated behind the cribriform plate?
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What is the location of the sella turcica?
What is the location of the sella turcica?
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Where is the vestibule of the nasal cavity located?
Where is the vestibule of the nasal cavity located?
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What structure is associated with the ethmoid air sinuses?
What structure is associated with the ethmoid air sinuses?
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Which nerve supplies the sphenoidal sinuses?
Which nerve supplies the sphenoidal sinuses?
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Which concha (turbinate) is the largest and most visible in the anterior portion of the nasal cavity?
Which concha (turbinate) is the largest and most visible in the anterior portion of the nasal cavity?
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What is a primary function of the sphenoidal sinuses?
What is a primary function of the sphenoidal sinuses?
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Which of the following structures connects the middle ear with the nasopharynx?
Which of the following structures connects the middle ear with the nasopharynx?
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What structure is located lateral to the ethmoid air sinuses?
What structure is located lateral to the ethmoid air sinuses?
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Into which anatomical space do the sphenoidal sinuses open?
Into which anatomical space do the sphenoidal sinuses open?
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Where is the maxillary sinus located?
Where is the maxillary sinus located?
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How many sphenoidal sinuses are there?
How many sphenoidal sinuses are there?
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What is one of the primary functions of the paranasal sinuses?
What is one of the primary functions of the paranasal sinuses?
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Which of the following is true about the maxillary sinuses?
Which of the following is true about the maxillary sinuses?
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Which nerves supply the maxillary sinuses?
Which nerves supply the maxillary sinuses?
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Into which meatus do the maxillary sinuses open?
Into which meatus do the maxillary sinuses open?
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Which teeth roots project into the maxillary sinus?
Which teeth roots project into the maxillary sinus?
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Where are the frontal sinuses located?
Where are the frontal sinuses located?
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How are the ethmoidal sinuses divided?
How are the ethmoidal sinuses divided?
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Which part of the sinuses is supplied by the supraorbital nerve?
Which part of the sinuses is supplied by the supraorbital nerve?
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Through which structure do the frontal sinuses open into the middle meatus?
Through which structure do the frontal sinuses open into the middle meatus?
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Which sinus group opens into the superior meatus?
Which sinus group opens into the superior meatus?
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Study Notes
Nose
- The nose is the only externally visible part of the respiratory system.
- It has a free tip and is attached to the forehead by the root or bridge.
- The nose has two openings, the anterior (external) nares or nostrils, which lead to the nasal cavity.
- Each nostril is bounded laterally by the ala and medially by the nasal septum.
- The nose consists of a bony and cartilaginous framework.
- Formed above by the nasal bones, frontal processes of maxillae, and nasal part of frontal bone.
- Formed below by plates of hyaline cartilage, which include upper and lower nasal cartilages and the septal cartilage.
Nasal Cavity
- Extends from the external (anterior) nares to the posterior nares (choanae).
- Divided into right and left halves by the nasal septum.
- Each half has a floor, roof, lateral wall, and medial wall (septum).
- The nasal cavity is divided into right and left halves by the nasal septum.
- Each half of the nasal cavity has a floor, roof, lateral wall, and medial wall (septum).
- The cribriform plate of ethmoid bone is located at the roof and separates the nasal cavity from the cranial cavity above it.
- The frontal sinus is situated above the cribriform plate.
- The sphenoid sinus is visible behind the cribriform plate.
- The ethmoid air sinuses are located lateral to the cribriform plate and are closely associated with the olfactory region.
- The sella turcica is a saddle-shaped depression in the sphenoid bone that houses the pituitary gland.
Functions of the Nose and Nasal Cavity
- Modify the air we breathe by warming, humidifying, and filtering it.
- Produce the resonance of speech.
- House the olfactory mucosa, which is responsible for our sense of smell.
- Contribute to the appearance of the face.
Paranasal Sinuses
- Are air-filled cavities within the bones of the face surrounding the nasal cavity.
- Include the frontal, ethmoid, sphenoid, and maxillary sinuses.
- Functions:
- Lighten the skull.
- Act as resonant chambers for speech.
- Help to warm, clean, and moisten the air we breathe.
Maxillary Sinus
- Located within the body of the maxilla.
- Pyramidal in shape with the base forming the lateral wall of the nose and the apex lying in the zygomatic process of the maxilla.
- Roof: formed by the floor of the orbit.
- Floor: formed by the alveolar border.
- Roots of 1st and 2nd premolars and the 3rd molar (sometimes canines) project into the sinus.
- Opens into the middle meatus through the hiatus semilunaris.
- Supplied by superior alveolar and infraorbital nerves.
Other Paranasal Sinuses
- Frontal sinus: located within the frontal bone.
- Ethmoid sinus: located in the ethmoid bone.
- Sphenoid sinus: located in the sphenoid bone.
Diagnosis of Paranasal Sinuses Defect
- Diagnosis of paranasal sinuses defect by X-ray and Computed Tomography (CT).
- CT scanning is painless, noninvasive, and accurate.
- CT scanning is the most reliable imaging technique for determining if the sinuses are obstructed.
- CT scanning is the best imaging modality for sinusitis.
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Description
Learn about the structure and components of the human nose, including its bony and cartilaginous framework, nasal cavity, and external features.
