Sinuses
- Air sinuses reduced the weight of the skull
and add resonance to the voice
- Unfortunately they are sites prone to infection
- Important to know the relations of the sinus to know what may become
involved in infection
Maxillary
- pyramidal in shape
- lined with mucous membrane
- innervated by infraobital nerve (pain referred to upper jaw)
- drainage high up in sinus opens up into middle meatus
- roof formed by floor of orbit
- floor formed by alveolar process (roots of upper teeth below sinus)
Frontal
- roughly triangular in shape
- opens into infundibulum (middle meatus) of nose
- supplied by supraorbital nerve
Sphenoidal sinuses
- opens above superior concha
- supplied by posterior ethmoidal nerves (opthalmic)
Ethmoidal
- between nose and orbit
- opens into infundibulum, middle meatus and superior meatus
- supplied by anterior and posterior ethmoidal nerves
Disorders
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