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===Sinuses===
 
===Sinuses===
**Size, arrangement and number vary with species
+
*Size, arrangement and number vary with species
**Poorly developed in carnivores
+
*Poorly developed in carnivores
***Poor communication of frontal sinus in cats with nasal cavity
+
**Poor communication of frontal sinus in cats with nasal cavity
****Predisposed to frontal sinus bacterial infections
+
***Predisposed to frontal sinus bacterial infections
***Maxillary sinus opening very large - 'maxillary recess'
+
**Maxillary sinus opening very large - 'maxillary recess'
****Maxillary sinus infections very uncommon in carnivores
+
***Maxillary sinus infections very uncommon in carnivores
***Highly developed in horses
+
**Highly developed in horses
***Slit-like, high openings in horses
+
**Slit-like, high openings in horses
***Predisposed to bacterial infections
+
**Predisposed to bacterial infections
***Cheek teeth embedded within the maxillary sinuses
+
**Cheek teeth embedded within the maxillary sinuses
***Maxillary sinusitis secondary to tooth root abscesses
+
**Maxillary sinusitis secondary to tooth root abscesses
 +
 
 
===Guttural pouch===
 
===Guttural pouch===
 
**Horses
 
**Horses
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