Changes

*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 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]].

*'''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.  

In addition to the Frontal sinus, there is a ''Palatomaxillary sinus'' (named because the Maxillary Sinus is continuous with the Palatine Sinus) within the caudal part of the [[Hard Palate - Anatomy & Physiology|hard palate]] and face, a ''Lacrimal sinus'' within the medial orbit, ''Sphenoidal sinuses'' which lie past the orbit and within the conchae themselves are the ''Conchal sinuses''. The Frontal sinus in cattle has a 'diverticle' for the Cornual Process (horn).

In addition to the Frontal sinus, there is a ''Palatomaxillary sinus'' (named because the Maxillary Sinus is continuous with the Palatine Sinus) within the caudal part of the [[Hard Palate|hard palate]] and face, a ''Lacrimal sinus'' within the medial orbit, ''Sphenoidal sinuses'' which lie past the orbit and within the conchae themselves are the ''Conchal sinuses''. The Frontal sinus in cattle has a 'diverticle' for the Cornual Process (horn).

*The '''Pig''' has ''Lacrimal, Sphenoid'' and ''Conchal'' sinuses in addition to the Maxillary and Frontal systems.

*The '''Pig''' has ''Lacrimal, Sphenoid'' and ''Conchal'' sinuses in addition to the Maxillary and Frontal systems.

*There are many variations to the entire [[Avian Respiration - Anatomy & Physiology|'''Avian''' respiratory tract]].

*There are many variations to the entire [[Avian Respiration - Anatomy & Physiology|'''Avian''' respiratory tract]].