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Diseases of the Nasal Cavities and Paranasal Sinuses (6959 words) |
 | The frontal and maxillary sinuses are air filled spaces formed by the evagination of the frontal and maxillary bones into the embryonic nasal cavity and these sinuses communicate directly with the nasal cavity [ 6 ]. |
| The maxillary sinuses in the horse are unique in being divided into separate rostral and caudal parts by a thin, cribiform bony septum, which is variable in position [ 4 ] and is often incomplete in the donkey. |
| Proliferation of the maxillary bones due to nutritional secondary hyperparathyroidism causing nasal airway obstruction may be due to excessive dietary phosphorus [ 57-59 ], due to a diet consisting of excessive amounts of bran or grazing on certain tropical grasses. |
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