Maxillary Sinus Anatomy
24 Questions
5 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the average capacity of the maxillary sinus?

  • 25 ml
  • 20 ml
  • 15 ml (correct)
  • 10 ml

    • During which stage of life do the maxillary sinuses develop?

  • During the third month of intrauterine life (correct)
  • At birth
  • After the eruption of the permanent teeth
  • During puberty

    • What is the location of the ostium maxillare?

  • In the middle nasal meatus (correct)
  • In the oral cavity
  • In the nasal cavity
  • In the floor of the orbit

    • What is the main direction of expansion of the maxillary sinus during its development?

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

    What is the consequence of facial growth on the maxillary sinus?

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

    When does the growth of the maxillary sinus slow down?

    <p>During puberty</p> Signup and view all the answers

    What is the approximate width of the maxillary sinus?

    <p>2.5 cm</p> Signup and view all the answers

    What is the location of the maxillary sinus in the body?

    <p>In the body of the maxilla</p> Signup and view all the answers

    What is the size of the maxillary sinus at birth?

    <p>8X4 mm</p> Signup and view all the answers

    What is the shape of the maxillary sinus?

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

    What is the function of the maxillary sinus in relation to the skull?

    <p>Lightening the weight of the skull</p> Signup and view all the answers

    Where is the ostium of the maxillary sinus located?

    <p>On the top of the medial wall of the sinus</p> Signup and view all the answers

    What is produced by the maxillary sinus?

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

    What is the function of the maxillary sinus in relation to voice?

    <p>Resonance of voice</p> Signup and view all the answers

    Which tooth is located in the floor of the maxillary sinus?

    <p>All of the above</p> Signup and view all the answers

    What is the function of the maxillary sinus in relation to olfaction?

    <p>Regulating olfactory modulation</p> Signup and view all the answers

    What is the epithelial layer of the maxillary sinus mucous membrane composed of?

    <p>Pseudostratified columnar ciliated cells and other types</p> Signup and view all the answers

    What is the function of the goblet cell in the maxillary sinus?

    <p>To produce and secrete mucous</p> Signup and view all the answers

    What is the characteristic of the subepithelial connective tissue layer of the maxillary sinus?

    <p>It is loose and contains few elastic fibers</p> Signup and view all the answers

    What is the type of mucous membrane that lines the maxillary sinus?

    <p>Respiratory type</p> Signup and view all the answers

    What is the difference between the mucous membrane of the maxillary sinus and the nasal cavity?

    <p>The mucous membrane of the maxillary sinus is thinner</p> Signup and view all the answers

    What is the clinical condition characterized by the communication between the oral cavity and the maxillary sinus?

    <p>Oro-antral fistula</p> Signup and view all the answers

    What type of glands are present in the subepithelial connective tissue layer of the maxillary sinus?

    <p>Serous and mucous glands</p> Signup and view all the answers

    What is the route by which the secretions of the serous and mucous glands reach the sinus lumen?

    <p>Through excretory ducts that pierce the basal lamina</p> Signup and view all the answers

    Study Notes

    Maxillary Sinus Overview

    • Maxillary sinus, also known as the Antrum of Higmore, is the largest bilateral air sinus in the maxilla, providing a pneumatic space.
    • It opens into the middle nasal meatus via openings known as ostium maxillare, located in the hiatus semilunaris.
    • Average dimensions: approximately 3.5 cm (anterior-posterior) x 3.2 cm (height) x 2.5 cm (width).
    • Average capacity is around 15 ml.

    Development and Growth

    • Develops by the third month of intrauterine life, expanding from the mucous membrane of the nasal cavity.
    • Enlarge primarily inferiorly in the maxilla and continue to grow variably with facial growth until adult size is achieved by the eruption of permanent teeth.
    • At birth, size is comparable to a small lima bean (8x4 mm), with a shape and orientation directed anteriorly and posteriorly.

    Anatomical Features

    • Shape: Pyramidal with a base, apex, and four walls.
    • Base: Lateral wall of the nasal cavity.
    • Apex: Directed towards the zygomatic process of the maxilla.
    • Anterior wall: Facial surface of the maxilla.
    • Posterior wall: Infratemporal surface of the maxilla.
    • Roof: Floor of the orbit; Floor: Alveolar process of the maxilla.

    Functions of Maxillary Sinus

    • Reduces skull weight and enhances voice resonance.
    • Regulates air pressure during respiration for olfactory and respiratory modulation.
    • Conditions inspired air and provides craniofacial protection against trauma.
    • Produces lysozyme, a bactericidal enzyme, aiding in protecting against nasal mucosa infections.

    Opening and Drainage

    • The sinus drains into the nasal cavity through its ostium, positioned at the highest part of the medial wall within the hiatus semilunaris.

    Relation to Teeth

    • Floor of the sinus correlates with the roots of permanent teeth, including first molars, second and third molars, first and second premolars, and occasionally canines.
    • Deciduous teeth correspond as well (D E, rarely C).

    Histology

    • Lined with a thinner respiratory-type mucous membrane than the nasal cavity.
    • Consists of pseudostratified columnar ciliated cells, basal cells, columnar non-ciliated cells, and goblet cells (mucus-producing).
    • Lamina propria contains loose collagen bundles, few elastic fibers, serous, and mucous glands with ducts leading into the sinus.

    Clinical Considerations

    • Conditions like maxillary sinusitis, oro-antral fistula/communication, cysts, and tumors can affect the maxillary sinus.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge of the maxillary sinus, a pneumatic space located in the body of the maxilla. Learn about its dimensions, openings, and location in the nasal cavity.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser