Podcast
Questions and Answers
Where do the maxillary sinuses drain into the nasal cavity?
Where do the maxillary sinuses drain into the nasal cavity?
Which artery supplies blood to the ethmoid sinuses?
Which artery supplies blood to the ethmoid sinuses?
What is the main nerve that innervates the sphenoid sinuses?
What is the main nerve that innervates the sphenoid sinuses?
Which of the following sinuses is the largest?
Which of the following sinuses is the largest?
Signup and view all the answers
Which nerve provides innervation to the maxillary sinus?
Which nerve provides innervation to the maxillary sinus?
Signup and view all the answers
Where do the posterior ethmoid sinuses open into the nasal cavity?
Where do the posterior ethmoid sinuses open into the nasal cavity?
Signup and view all the answers
What condition can arise from the spread of an upper respiratory tract infection to the sinuses?
What condition can arise from the spread of an upper respiratory tract infection to the sinuses?
Signup and view all the answers
Which structure is known to drain into the nasal cavity through the hiatus semilunaris?
Which structure is known to drain into the nasal cavity through the hiatus semilunaris?
Signup and view all the answers
What is the primary role of the nasal cavity?
What is the primary role of the nasal cavity?
Signup and view all the answers
What symptom may result from inflammation of the maxillary sinus?
What symptom may result from inflammation of the maxillary sinus?
Signup and view all the answers
Which of the following sinuses opens at the hiatus semilunaris in the middle meatus?
Which of the following sinuses opens at the hiatus semilunaris in the middle meatus?
Signup and view all the answers
Which epithelium lines the vestibular region of the nasal cavity?
Which epithelium lines the vestibular region of the nasal cavity?
Signup and view all the answers
What type of cells in the respiratory region secrete mucus?
What type of cells in the respiratory region secrete mucus?
Signup and view all the answers
Which area of the nasal cavity is responsible for the sense of smell?
Which area of the nasal cavity is responsible for the sense of smell?
Signup and view all the answers
Which structure divides the nasal cavity into two equal sections?
Which structure divides the nasal cavity into two equal sections?
Signup and view all the answers
What forms the lower front part of the nasal septum?
What forms the lower front part of the nasal septum?
Signup and view all the answers
What is the function of the vibrissae in the nasal cavity?
What is the function of the vibrissae in the nasal cavity?
Signup and view all the answers
What characterizes the respiratory region of the nasal cavity?
What characterizes the respiratory region of the nasal cavity?
Signup and view all the answers
Which part of the nasal cavity is most exposed to environmental factors?
Which part of the nasal cavity is most exposed to environmental factors?
Signup and view all the answers
What structure is NOT part of the respiratory system along with the nasal cavity?
What structure is NOT part of the respiratory system along with the nasal cavity?
Signup and view all the answers
What bones contribute to the roof of the nasal cavity?
What bones contribute to the roof of the nasal cavity?
Signup and view all the answers
Which structure separates the nasal cavity from the oral cavity?
Which structure separates the nasal cavity from the oral cavity?
Signup and view all the answers
What is NOT a function attributed to the paranasal sinuses?
What is NOT a function attributed to the paranasal sinuses?
Signup and view all the answers
Which of the following pairs includes all the named paranasal sinuses?
Which of the following pairs includes all the named paranasal sinuses?
Signup and view all the answers
Which of the following is true regarding the connection between the nasal and oral cavities?
Which of the following is true regarding the connection between the nasal and oral cavities?
Signup and view all the answers
Where can openings to the paranasal sinuses typically be found?
Where can openings to the paranasal sinuses typically be found?
Signup and view all the answers
What type of epithelium lines the paranasal sinuses?
What type of epithelium lines the paranasal sinuses?
Signup and view all the answers
Which of the following correctly describes the frontal sinuses?
Which of the following correctly describes the frontal sinuses?
Signup and view all the answers
Which bone does NOT form part of the posterior border of the nasal cavity?
Which bone does NOT form part of the posterior border of the nasal cavity?
Signup and view all the answers
What is the primary role of the soft palate and uvula during eating?
What is the primary role of the soft palate and uvula during eating?
Signup and view all the answers
Study Notes
The Nasal Cavity
- Structure: The nasal cavity is the interior of the nose, located behind the nostrils.
- Function: Responsible for smell, respiration, and speech production.
- Vestibule: The area just posterior to the nostrils, lined with multiple layers of stratified squamous epithelium. It contains stiff hairs called vibrissae covered in thick mucus.
- Respiratory Region: Extends from the vestibule and includes the entire nasal cavity, apart from the olfactory region. It is lined with ciliated pseudostratified epithelium containing goblet cells which secrete mucus.
- Olfactory Region: Located at the top of the nasal cavity near the septum. It is lined with olfactory cells and olfactory mucosa containing cilia with olfactory receptor proteins responsible for the sense of smell.
Walls and Boundaries of the Nasal Cavity
- Medial Wall: The septum divides the cavity into two equal sections. The upper and lower parts of the septum are formed by the perpendicular plate of the ethmoid bone and the vomer. The lower front part is formed by a quadrangular hyaline cartilage structure called the septum cartilage.
- Superior Border (Roof): Formed by nasal bones, the lower part of the frontal bone, the cribiform plate of the ethmoid bone, and the sphenoid bone.
- Lateral Wall: Formed by the lower parts of the nasal bones, attached cartilage, the outer nose, and the nostrils.
- Posterior Border (Back Wall): Bordered by the maxilla, ethmoid bone, palatine bone, sphenoid bone, lacrimal bone, and the inferior concha.
- Floor: Formed by the hard palate, composed of the palatine process of the maxilla and the palatine bones. The floor separates the nasal cavity from the oral cavity.
- Nasopharynx: The nasal and oral cavities connect via the nasopharynx at the back of the throat. The soft palate and uvula close off this connection during eating preventing food from entering the nasal cavity.
The Paranasal Sinuses
- Definition: Air-filled extensions of the nasal cavity.
- Types: Four sinuses – maxillary, frontal, sphenoid, and ethmoid – named after the bone they are located in.
- Lining: Each sinus is lined with ciliated pseudostratified epithelium containing mucus-secreting goblet cells.
- Function: Lightening the weight of the head, supporting nasal cavity immune defence, humidifying inspired air, and increasing voice resonance.
Paranasal Sinus Locations & Drainage
- Frontal Sinuses: Two located within the frontal bone, most superior of the sinuses. They are roughly triangular in shape and drain via the frontonasal duct, which opens into the hiatus semilunaris within the middle meatus of the nasal cavity.
- Sphenoid Sinus: Located within the sphenoid bone and drain into the nasal cavity in an area superior and posterior to the superior concha known as the spheno-ethmoidal recess.
-
Ethmoid Sinuses: Found within the ethmoid bone.
- Anterior: Open onto the hiatus semilunaris (middle meatus)
- Middle: Opens onto the lateral wall of the middle meatus.
- Posterior: Opens onto the lateral wall of the superior meatus.
- Maxillary Sinuses: Largest of the sinuses, located laterally and slightly inferior to the nasal cavity. They drain into the nasal cavity via the hiatus semilunaris underneath the frontal sinus opening.
Clinical Relevance of the Paranasal Sinuses
- Sinusitis: An upper respiratory tract infection can spread to the sinuses causing inflammation and pain.
- Toothache: The maxillary nerve supplies both the maxillary sinus and maxillary teeth. Inflammation of the maxillary sinus can present as toothache.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz explores the anatomy and functions of the nasal cavity, including its various regions such as the vestibule, respiratory region, and olfactory region. Test your knowledge on the structure, boundaries, and role of the nasal cavity in respiration and smell.