Ethmoid Sinus
Ethmoidal Sinuses are two small bony cavities present in the skull. They are paired and present on both sides of the nose. They are a part of Paranasal Sinuses and there are 3 other pairs of sinuses. They are also known as Ethmoidal Air Cells.
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Terms
Sinus Frontalis Superior Nasal ConchalInferior Nasal Concha Nasal CavitySinus Sphenoidalis Alveoli Larynx Nasopharynx
Oropharynx Laryngopharynx Frontal SinusSphenoid SinusEthmoid Sinus Maxillary SinusBronchus Vertebrate Trachea Bronchioles Capillary Beds
Alveolar Duct Alveolar Sacs Pulmonary VeinPulmonary Artery
Ethmoid Sinus
STRUCTURE AND POSITION
- Each of the Ethmoid Sinus is present between the thin Nasal and Orbital Plates. Their separations are thin walls. They are present inside the Ethmoid Bone hence named so.
- Ethmoidal Air sinuses form small cavities inside the Labyrinth (mass) of the Ethmoid Bone. They are of different shape and size on both sides.
- They are covered and completed at sides by Frontal (superiorly), Palatine (inferiorly), Lacrimal (medially), Maxilla (laterally) and Sphenoidal (posteriorly) bones.
- Each of the Ethmoid Sinus is further divided into three parts. Anterior, Middle and Posterior.
FUNCTION AND SIGNIFICANCE
- Air sinuses like Ethmoid Sinus make the skull lighter. They also help in the resonance of voice.
- Ethmoid Sinus can get infected in Children and this condition is known as Acute Ethmoiditis.
- Ethmoidal Carcinoma is malignancy of the Ethmoid bone and sinus. It can spread to the nearby organs like Brain or Eyes.
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