Maxillary Sinus Question And Answers

“What is the maxillary sinus? A detailed question and answers guide”

Maxillary sinus.
Answer:

Maxillary sinus Definition:

• The maxillary sinus is the pneumatic space that is lodged inside the body of the maxilla and communicates with the environment by way of the middle meatus and the nasal vestibule.

Maxillary sinus Anatomy:

• The maxillary sinus is a four-sided pyramid in structure.
  1. Base – faces medially towards the nasal cavity.
  2. Apex – faces laterally toward the body of the zygomatic bone.

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Maxillary sinus Sides:

1. Anterior – facial surface of maxilla.
2. Inferior – alveolar and zygomatic process of maxilla.
3. Superior – orbital surface of the maxilla.
4. Posterior – infratemporal surface and meet at an obtuse angle.

Recesses: Expansion of processes of the maxilla that have become invaded by air space. They are

1. 1. Zygomatic recess
   2. Frontal recess
   3. Alveoloplatine recess.

Maxillary sinus Histology:

• The maxillary sinus is lined by a mucosa that is firmly bound to the underlying periosteum.
• Layers lining the space of the maxillary sinus are
  1. Epithelial layer
  2. Basal layer
  3. Subepithelial layer.

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Maxillary sinus Cells:

1. Basal cells
2. Columnar nonciliated cells.
3. Mucous-producing secretory goblet cells
4. Ciliated cells.
5. myoepithelial cells.

Maxillary sinus Functions:

• Olfactory function
• Respiratory function
• Resonance of voice
• Lightening of skull weight
• Humidification of air
• Enhancement of the faciocranial resistance to mechanical shock.
• Bacteriocidal activity.

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Maxillary sinus Relations:

• Roof – infraorbital nerve.
• Anterior – anterosuperior alveolar nerve.
• Lateral – middle superior alveolar nerve
• Posterior – posterosuperior alveolar nerve
• Posteromedial – greater and lesser palatine nerve
• Floor- roots of maxillary posterior teeth.