Maxillary Sinus
(Antrum of Highmore)
(Antrum of Highmore)
Overview: The largest of the paranasal sinuses. It occupies the body of the maxilla.
Morphology:
- Shape: Pyramidal.
- Base: Towards lateral wall of nose.
- Apex: Directed laterally into Zygomatic process (or bone).
Dimensions & Capacity
| Parameter | Value (Adult Average) |
|---|---|
| Height | 33 mm |
| Depth | 35 mm |
| Width | 25 mm |
| Capacity | 15 mL |
Relations (Boundaries)
1. Walls
- Anterior Wall: Facial surface of maxilla; related to soft tissues of cheek.
- Posterior Wall: Related to Infratemporal & Pterygopalatine fossae.
- Medial Wall: Related to Middle and Inferior meatuses.
- Structure: Thin and membranous at places.
- Relations: Uncinate process, fontanelles, inferior turbinate.
- Roof: Formed by floor of Orbit. Traversed by Infraorbital nerve & vessels.
2. Floor (Dental Relations)
Formed by alveolar and palatine processes of maxilla.
- Level: Situated about 1 cm below the level of floor of nose.
- Tooth Relations: Usually roots of 2nd Premolar & 1st Molar.
- Variation: Depending on pneumatization, can relate to all molars, premolars, and canine.
Clinical Significance:
Roots are often separated from the sinus by a very thin lamina of bone (or no bone at all).
1. Oroantral Fistula: Can result from extraction of these teeth.
2. Maxillary Sinusitis: Dental infection is an important cause.
Roots are often separated from the sinus by a very thin lamina of bone (or no bone at all).
1. Oroantral Fistula: Can result from extraction of these teeth.
2. Maxillary Sinusitis: Dental infection is an important cause.
📚 Source: ENT Dhingra
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