Changes

*In the '''Dog''' the sinus system is generally poorle developed. The Maxillary sinus is a cavity, freely communicating 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 '''Dog''' the sinus system is generally poorle developed. The Maxillary sinus is a cavity, freely communicating 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.

*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.

*'''Cattle''' have a fully developed sinus system by the age of 7. The Frontal sinus in cattle has a 'diverticle' for the Cornual Process (horn).

*'''Cattle''' do not have a fully developed sinus system until the age of 7. The Frontal sinus in cattle has a 'diverticle' for the Cornual Process (horn).

The complete set of sinuses is complex. 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 and face, a ''lacrimal sinus'' within the medial orbit, ''sphenoidal sinuses'' which lie past the orbit and within the conchae themselves is the ''conchal sinuses''.

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