Changes

==Function==

==Function==

The function of paranasal sinuses is somewhat ambiguous, however they are likely to have the following evolutionary purposes; Resonating cavities; Limiting the weight of the [[Skull and Facial Muscles - Anatomy & Physiology#Bones of the Skull|skull]]; Insulation/cooling of the [[Nervous and Special Senses - Anatomy & Physiology#Central Nervous System (CNS)|brain]] and increased insertion space for [[:Category:Teeth - Anatomy & Physiology|teeth]].

The function of paranasal sinuses is somewhat ambiguous, however they are likely to have the following evolutionary purposes:

:Resonating cavities

:Limiting the weight of the [[Skull and Facial Muscles - Anatomy & Physiology#Bones of the Skull|skull]]

:Insulation/cooling of the [[Nervous and Special Senses - Anatomy & Physiology#Central Nervous System (CNS)|brain]]  

:Increased insertion space for [[:Category:Teeth - Anatomy & Physiology|teeth]]

==Species Differences==

==Species Differences==

In the '''dog''' the sinus system is generally poorly developed. The maxillary sinus is a cavity which freely communicates with the nasal cavity, and is known as the '''Maxillary Recess'''. The frontal sinus has 3 chambers which drain separately into the [[Nasal Cavity - Anatomy & Physiology|nasal cavity]].

In the '''dog''' the sinus system is generally poorly developed. The maxillary sinus is a cavity which freely communicates with the nasal cavity, and is known as the '''maxillary recess'''. The frontal sinus has 3 chambers which drain separately into the nasal cavity.

In the '''horse''' the maxillary sinus has caudal and rostral parts which together occupy a large part of the upper jaw. In addition, the horse has '''sphenopalatine''' and '''ethmoidal''' sinuses which are of less clinical importance than the '''frontal, caudal maxillary''' and '''rostral maxillary sinuses''' on each side of the [[Skull and Facial Muscles - Anatomy & Physiology#Bones of the Skull|skull]].

In the '''horse''' the maxillary sinus has caudal and rostral parts which together occupy a large part of the upper jaw. In addition, the horse has '''sphenopalatine''' and '''ethmoidal''' sinuses which are of a lesser clinical importance than the '''frontal, caudal maxillary''' and '''rostral maxillary sinuses''' on each side of the [[Skull and Facial Muscles - Anatomy & Physiology#Bones of the Skull|skull]].

'''Cattle''' do not have a fully developed sinus system until the age of 7, by which time it is an extremely complex system.

'''Cattle''' do not have a fully developed sinus system until the age of 7, by which time it is an extremely complex system.

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

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

[[Category:To Do - AimeeHicks]][[Category:To Do - Review]]

[[Category:A&P Done]]