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Paranasal Sinuses

Introduction to the Paranasal Sinuses:

The anterior, coronal, and sagittal view of the paranasal sinuses
The anterior, coronal, and sagittal view of the paranasal sinuses
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  • These air – filled spaces vary in size and are lined by mucous membrane.
  • The mucous secretions drain into the nasal cavity and help, warm, humidify, and clean the air.
  • The paranasal sinuses also help lighten the skull and resonate the voice.

Anterior View:

  1. image descriptionFrontal sinuses – two cavities located just above the orbits and behind the superciliary arches. [image descriptionAnterior view]
Paranasal sinuses - anterior view
The frontal sinus - anterior view
The frontal sinus - anterior view
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  • Mucous secretions are drained from each sinus by a frontonasal duct, which empties into the nasal cavity at the middle meatus.

Coronal View:

  1. image descriptionEthmoid sinuses – a collection of small cavities located between the orbits in the lateral masses (or labyrinths) of the ethmoid bone. [image descriptionCoronal view]
The coronal view of the paranasal sinuses
The ethmoid sinus - coronal view
The ethmoid sinus - coronal view
The coronal view of the ethmoid sinuses
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  • Each lateral mass contains approximately 6 to 12 cavities, which are referred to as ethmoid air cells.
  • The mucous secretions produced by the air cells drain into the nasal cavity at the superior and middle meatuses.
  1. image descriptionMaxillary sinuses – two large, cavities located in the body of the maxillary bone, on either side of the nasal cavity. [image descriptionCoronal view]
The coronal view of the paranasal sinuses
The maxillary sinus - coronal view
The maxillary sinus - coronal view
The coronal view of the maxillary sinuses
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  • Mucous produced by each sinus drains into the mid-lateral wall of the nasal cavity.

Sagittal View:

  1. image descriptionSphenoid sinuses – two cavities (right & left) in the centre (or body) of the sphenoid bone. [image descriptionSagittal view]
paranasal sinuses - sagittal view
The sphenoid sinus - sagittal view
The sphenoid sinus - sagittal view
The sagittal view of the sphenoid sinuses
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  • A thin bony septum separates the two sinuses.
  • Mucous from the sinuses drains into the spheno-ethmoidal recess located at the top of the nasal cavity.
  1. image descriptionFrontal sinuses – two cavities located just above the orbits and behind the superciliary arches. [image descriptionSagittal view]
paranasal sinuses - sagittal view
The frontal sinus - sagittal view
The frontal sinus - sagittal view
The sagittal view of the frontal sinus
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  • Mucous secretions are drained from each sinus by a frontonasal duct, which empties into the nasal cavity at the middle meatus.

Test yourself:

Anterior view [image descriptionShow/image descriptionHide answers]

Paranasal sinuses - anterior view - test yourself
Paranasal sinuses - anterior view - test yourself
Test yourself - anterior view
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Test yourself:

Coronal view [image descriptionShow/image descriptionHide answers]

paranasal sinuses - coronal view - test yourself
paranasal sinuses - coronal view - test yourself
Test yourself - coronal view
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Test yourself:

Sagittal view [image descriptionShow/image descriptionHide answers]

paranasal sinuses - sagittal view - test yourself
paranasal sinuses - sagittal view - test yourself
Test yourself - Sagittal view
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