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Anatomy of the Nose
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Anatomy of the Nose

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Questions and Answers

What structures form the nose above?

  • Nasal bones, Maxillary sinuses, Sphenoid bone
  • Nasal bones, Frontal processes of maxillae, Nasal part of frontal bone (correct)
  • Anterior nares, Posterior nares, Frontal bone
  • Upper cartilage, Lower cartilage, Septal cartilage

    • Which type of cartilage is involved in the structure of the lower part of the nose?

  • Elastic cartilage
  • Fibrocartilage
  • Reticular cartilage
  • Hyaline cartilage (correct)

    • What separates the right and left halves of the nasal cavity?

  • Frontal bone
  • Lateral cartilage
  • Lateral wall
  • Nasal septum (correct)

    • Where does the nasal cavity extend from and to?

    <p>From the external nares to the posterior nares</p> Signup and view all the answers

    Which part of the nasal structure includes the upper and lower nasal cartilages?

    <p>Plates of hyaline cartilage</p> Signup and view all the answers

    What is the nose attached to the forehead by?

    <p>The root or the bridge</p> Signup and view all the answers

    Which part of the respiratory system is externally visible?

    <p>Nose</p> Signup and view all the answers

    What are the anterior openings of the nose called?

    <p>Nares or nostrils</p> Signup and view all the answers

    What bounds each nostril laterally?

    <p>Ala</p> Signup and view all the answers

    How many openings does the nose have?

    <p>Two</p> Signup and view all the answers

    What forms the floor of the nasal cavity?

    <p>The hard palate</p> Signup and view all the answers

    Which bone is part of the roof of the nasal cavity?

    <p>The sphenoid bone</p> Signup and view all the answers

    Which structure forms the posterior part of the nasal septum?

    <p>The vomer bone</p> Signup and view all the answers

    What covers the nasal septum?

    <p>The mucoperiosteum</p> Signup and view all the answers

    Which bone forms the superior part of the nasal septum?

    <p>The perpendicular plate of ethmoid bone</p> Signup and view all the answers

    Which of the following structures is covered by a mucous membrane?

    <p>Superior conchae</p> Signup and view all the answers

    How many horizontal bony projections does the lateral wall show?

    <p>Three</p> Signup and view all the answers

    Which conchae is NOT one of the three horizontal bony projections in the lateral wall?

    <p>Lateral conchae</p> Signup and view all the answers

    What is another name for the conchae?

    <p>Turbinates</p> Signup and view all the answers

    Which of the following best describes the orientation of the bony projections in the lateral wall?

    <p>Horizontal</p> Signup and view all the answers

    What structure separates the nasal cavity from the cranial cavity?

    <p>Cribriform plate of ethmoid bone</p> Signup and view all the answers

    Where is the optic nerve positioned in relation to the ethmoid air sinuses?

    <p>Lateral to the ethmoid air sinuses</p> Signup and view all the answers

    Which concha is the largest and visible in the anterior portion of the nasal cavity?

    <p>Inferior concha</p> Signup and view all the answers

    What is the function of the sella turcica?

    <p>It houses the pituitary gland</p> Signup and view all the answers

    What is the vestibulum of the nasal cavity?

    <p>The anterior part opening onto the anterior nares</p> Signup and view all the answers

    Which sinus is situated above the cribriform plate?

    <p>Frontal sinus</p> Signup and view all the answers

    Where is the posterior nasopharyngeal tonsil located?

    <p>At the junction between the nasopharynx and the oropharynx</p> Signup and view all the answers

    Which meatus is associated with the ethmoid air sinuses?

    <p>Superior nasal meatus</p> Signup and view all the answers

    What is one of the primary functions of the paranasal sinuses?

    <p>Lighten the skull</p> Signup and view all the answers

    Which specific bones form the roof of the maxillary sinus?

    <p>Floor of the orbit</p> Signup and view all the answers

    Into which structure do the maxillary sinuses open?

    <p>Middle meatus</p> Signup and view all the answers

    Which nerves supply the maxillary sinuses?

    <p>Superior alveolar &amp; infraorbital nerves</p> Signup and view all the answers

    Which anatomical structure forms the floor of the maxillary sinus?

    <p>Alveolar border</p> Signup and view all the answers

    Which imaging technique is considered the most reliable for determining if the sinuses are obstructed?

    <p>Computed Tomography (CT)</p> Signup and view all the answers

    Where are the frontal sinuses located?

    <p>In the frontal bone</p> Signup and view all the answers

    Which of the following characteristics describe CT scanning?

    <p>Painless, noninvasive, and accurate</p> Signup and view all the answers

    For diagnosing sinusitis, which is the best imaging modality?

    <p>CT scan</p> Signup and view all the answers

    Which sinuses are located within the maxillary bone?

    <p>Maxillary sinuses</p> Signup and view all the answers

    Which nerve supplies the sphenoidal sinuses?

    <p>Posterior ethmoidal nerve</p> Signup and view all the answers

    Where do the sphenoidal sinuses open into?

    <p>Sphenoethmoidal recess</p> Signup and view all the answers

    Which function is NOT associated with the sphenoidal sinuses?

    <p>Filter the blood</p> Signup and view all the answers

    How many sphenoidal sinuses are there?

    <p>Two</p> Signup and view all the answers

    Where is the maxillary sinus located?

    <p>Within the zygomatic process</p> Signup and view all the answers

    Where are the frontal sinuses located?

    <p>On either side of the frontal bone</p> Signup and view all the answers

    Which group of ethmoidal sinuses opens into the infundibulum?

    <p>Anterior group</p> Signup and view all the answers

    What divides the frontal sinuses from one another?

    <p>A bony septum</p> Signup and view all the answers

    Where does the middle group of the ethmoidal sinuses open?

    <p>Bulla</p> Signup and view all the answers

    Where are the maxillary sinuses located?

    <p>Under the orbits, in the upper jaw</p> Signup and view all the answers

    What role does the nasal cavity play in vocal sounds?

    <p>It helps produce vocal sounds.</p> Signup and view all the answers

    Which part of the nasal cavity is specifically involved in the sense of smell?

    <p>The top part of the nasal cavity</p> Signup and view all the answers

    Which of the following is NOT a function of the nasal cavity?

    <p>Initiating digestion</p> Signup and view all the answers

    What is the primary function of the cilia in the paranasal sinuses?

    <p>Propelling mucus toward the nasal cavity</p> Signup and view all the answers

    Where are the paranasal sinuses located?

    <p>Around the nasal cavity</p> Signup and view all the answers

    Which of the following bones do not house any of the paranasal sinuses?

    <p>Temporal bone</p> Signup and view all the answers

    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.
    • The bony framework is formed by the nasal bones, frontal processes of maxillae, and nasal part of frontal bone.
    • The cartilaginous framework is formed by plates of hyaline cartilage, which include upper and lower nasal cartilages and the septal cartilage.

    Nasal Cavity

    • The nasal cavity extends from the external (anterior) nares to the posterior nares (choanae).
    • The nasal cavity is divided into right and left halves by the nasal septum.
    • Each half has a floor, roof, lateral wall, and medial wall (septum).
    • The nasal septum is formed by the vertical (perpendicular) plate of ethmoid bone, vomer bone, and septal cartilage.
    • The cribriform plate of ethmoid bone is located at the roof of the nasal cavity 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.

    Functions of the Nose and Nasal Cavity

    • The nose and nasal cavity are responsible for:
      • Conditioning the air (warming, humidifying, and filtering)
      • Producing sounds (through vibrations of the nasal cavity)
      • Olfaction (smell)
      • Aesthetic appeal (shaping the face)

    Paranasal Sinuses

    • Paranasal sinuses are air-filled cavities located within the bones of the skull surrounding the nasal cavity.
    • They are lined with mucous membranes and are connected to the nasal cavity through small openings.
    • Functions of paranasal sinuses include:
      • Lightening the skull
      • Acting as resonant chambers for speech
      • Warming, cleaning, and moistening the incoming air

    Maxillary Sinuses

    • 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
    • Opens into the middle meatus through the hiatus semilunaris
    • Supplied by superior alveolar and infraorbital nerves

    Frontal Sinuses

    • Located within the frontal bone
    • Two in number
    • Connected to the nasal cavity through the nasofrontal duct

    Ethmoid Sinuses

    • Located within the ethmoid bone
    • Consist of multiple air-filled cells
    • Divided into anterior, posterior, and middle groups

    Sphenoid Sinuses

    • Located within the body of the sphenoid bone
    • Two in number
    • Open into the sphenoethmoidal recess
    • Supplied by the posterior ethmoidal nerve

    Diagnosis of Paranasal Sinuses Defect

    • Diagnosis can be made using 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

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    Description

    Learn about the structure and components of the nose, including its bony and cartilaginous framework, nasal cavity, and nostrils. Understand the different parts of the nose and their functions.

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