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[[Image:Nasal Cavities.jpg|thumb|right|300px|Nasal Cavities - Copyright David Bainbridge]]

[[Image:Nasal Cavities.jpg|thumb|right|300px|Nasal Cavities - Copyright David Bainbridge]]

The respiratory tract begins with the ''nose'' which includes the external nose, internal nasal cavities and [[Paranasal Sinuses - Anatomy & Physiology|paranasal sinuses]].

The respiratory tract begins with the ''nose'' which includes the external nose, internal nasal cavities and [[Paranasal Sinuses - Anatomy & Physiology|paranasal sinuses]].

As well as being vital for transport of gases to the [[Cardiorespiratory System Overview - Anatomy & Physiology#Lower Respiratory Tract|lower respiratory tract]], the nasal cavity is also the site for one of the special senses - [[Nose - Anatomy & Physiology|''Olfaction'']].

As well as being vital for transport of gases to the [[Cardiorespiratory System Overview - Anatomy & Physiology#Lower Respiratory Tract|lower respiratory tract]], the nasal cavity is also the site for one of the special senses - [[Nose - Anatomy & Physiology|''Olfaction'']].

==Structure==

==Structure==

The nose consists of the external nares with nasal [[Cartilage - Anatomy & Physiology#Structure and Function of Cartilage|cartilages]], the nasal cavity (including the nasal meatus and conchae), and the [[Paranasal Sinuses - Anatomy & Physiology|paranasal sinuses]].

The nose consists of the external nares with nasal [[Cartilage - Anatomy & Physiology#Structure and Function of Cartilage|cartilages]], the nasal cavity (including the nasal meatus and conchae), and the [[Paranasal Sinuses - Anatomy & Physiology|paranasal sinuses]].

The conchae are [[Cartilage - Anatomy & Physiology#Types of Cartilage|cartilage]] or ossified scrolls which arise from the [[Skull and Facial Muscles - Anatomy & Physiology#Ethmoid Bone (os ethmoidale|ethmoid bone]]. They are covered with mucous membrane, under which is a layer of anastomosing blood vessels. The nasal conchae are more complex in animals with a better sense of smell, as they increase the surface area of the olfactory region, further.

The conchae are [[Cartilage - Anatomy & Physiology#Types of Cartilage|cartilage]] or ossified scrolls which arise from the [[Skull and Facial Muscles - Anatomy & Physiology#Ethmoid Bone (os ethmoidale|ethmoid bone]]. They are covered with mucous membrane, under which is a layer of anastomosing blood vessels. The nasal conchae are more complex in animals with a better sense of smell, as they increase the surface area of the olfactory region, further.

There are '''dorsal''' and '''ventral conchae''', the dorsal concha originating from the ethmoid bone and attaching to the maxilla, and the venrtal conchae originating from the [[Skull and Facial Muscles - Anatomy & Physiology#Maxilla|maxilla]] and extending further into the nasal cavity. The conchae divide the nasal cavity into nasal ducts or '''meatuses''', which branch out from a common nasal meatus which is adjacent to the nasal septum. There are three nasal meatuses which branch from the common nasal meatus: '''dorsal''', '''middle''' and '''ventral''':

There are '''dorsal''' and '''ventral conchae''', the dorsal concha originating from the ethmoid bone and attaching to the maxilla, and the ventral conchae originating from the [[Skull and Facial Muscles - Anatomy & Physiology#Maxilla|maxilla]] and extending further into the nasal cavity. The conchae divide the nasal cavity into nasal ducts or '''meatuses''', which branch out from a common nasal meatus which is adjacent to the nasal septum. There are three nasal meatuses which branch from the common nasal meatus: '''dorsal''', '''middle''' and '''ventral''':

'''Dorsal nasal meatus'''

'''Dorsal nasal meatus'''

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{{Template:Learning

|dragster = [[Canine Head Radiographical Anatomy Resources (IV & V)|Canine Skull Anatomy - Nasal Chambers (V)]]

|dragster = [[Canine Head Radiographical Anatomy Resources (IV & V)|Canine Skull Anatomy - Nasal Chambers (V)]]

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[[Category:Respiratory System - Anatomy & Physiology]]

[[Category:Respiratory System - Anatomy & Physiology]]

[[Category:A&P Done]]

[[Category:A&P Done]]