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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.

Have you been making any of these common anatomy learning mistakes?

  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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