This document provides an overview of the nasal cavity and paranasal sinuses through descriptions of their gross anatomy, radiographic anatomy using x-ray, CT and MRI, and positioning for various imaging views. Key structures of the nasal cavity discussed include the nasal septum, lateral walls containing the maxillary, palatine, lacrimal and ethmoid bones. The four paranasal sinuses are also introduced as the frontal, ethmoid, sphenoid and maxillary sinuses.

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Nasal Cavity and
Paranasal Sinuses

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Roadmap
Gross
Introduction Positioning
Anatomy
Radiographic
X Ray CT
Anatomy
MRI Questions

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Introduction

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Introduction
 Nasal cavity is a passage from
the external nose anteriorly to
the nasopharynx posteriorly.
 The frontal, ethmoid, sphenoid
and maxillary sinuses form the
paired paranasal sinuses.
 They are situated around and
drain into the nasal cavity.
 The entire complex is lined by
mucus secreting epithelium.

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Gross
Anatomy

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Nasal Cavity
Nasal Cavity Sagittal View
 Nasal Septum
 Floor of the nasal cavity
 Lateral wall of the cavity

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Nasal Cavity
Lateral Wall Sagittal view
 Maxillary
 Palatine
 Lacrimal
 Ethmoid

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Nasal Cavity
Lateral Wall Sagittal view
 Sphenoethmoidal recess
 Superior Turbinate
 Superior Meatus
 Middle turbinate
 Middle meatus
 Inferior turbinate
 Inferior meatus

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Nasal Cavity
Lateral wall Sagittal view
 Sphenoid >> Spenoethmoidal
recess.
 Posterior group of ethmoid >>
superior meatus.
 Frontal + Ant Ethmoidal +
Maxillary >> middle meatus
 Nasolacrimal duct >> inferior
meatus

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Blood Supply of Nasal Cavity
 Sphenopalatine artery
 Greater palatine artery
 Superior labial branch of facial artery
 Anterior and posterior branches of ophthalmic artery
 Little’s area

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Paranasal Sinuses
 Frontal
 Ethmoid
 Sphenoid
 Maxillary

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Paranasal sinuses
Maxillary sinus Sphenoid sinus

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Positioning

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PA 15 Caldwell
Position Image

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Occipito Mental OM (Waters)
Position Image

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Lateral View
Position Image

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Radiologic
Anatomy

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Plain X-ray

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Nasal Bones

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Nasal Bones &
Septum

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Paranasal sinuses
PA 15 Caldwell

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Paranasal sinuses

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Paranasal sinuses
Lateral View

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CT

25. + Nasal
Maxillary Nasal
Septum
Zygomatic Sinus Concha
Arch Nasopharynx
Nasal Cavity
Axial view
Eustachian
Tube

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Nasal Cavity
Axial view

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Nasal Cavity
Coronal View

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Nasal Cavity
Coronal View
Turbinates

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Nasal Cavity
Coronal View

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Paranasal sinuses
Maxillary Sinus
Coronal View Turbinates

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Paranasal sinuses
Maxillary Sinus
Axial view Turbinates

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Paranasal sinuses
Maxillary Sinus
Coronal View Turbinates

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Paranasal sinuses
Maxillary Sinus
Coronal View Turbinates

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Frontal sinus
Paranasal sinuses
Frontal Sinus

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Paranasal sinuses
Frontal Sinus
Axial view

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Paranasal sinuses
Ethmoid Sinus
Coronal View Turbinates

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Paranasal sinuses
Ethmoid Sinus
Axial view Turbinates

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Paranasal sinuses
Ethmoid Sinus
Axial view Turbinates

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Paranasal sinuses
Ethmoid Sinus
Axial view Turbinates

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Paranasal sinuses
Sphenoid Sinus
Coronal View Turbinates

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Paranasal sinuses
Sphenoid Sinus
Coronal View Turbinates

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Paranasal sinuses
Sphenoid Sinus
Axial view Turbinates

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MRI

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MRI

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Questions ??

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