2. Maxillary sinuses
• Largest pns.
• Pyramidal in shape.
• base pointing to lateral
wall of nose.
• Apex laterally in the
zygomatic process.
• Capacity 15 ml.
3. Relations
• Anterior :- facial surface of
maxilla.
• Posterior :- infratemporal
and pterygopalatine fossa
• Medial :- middle and
inferor meatus
• Floor :- alveolar & palatine
processes of maxilla
• Roof :-floor of orbit
4. Blood & nerve supply
• Blood supply : Facial, infra orbital, greater palatine
arteries.
• Lymphatic drainage : Submandibular nodes.
• Nerve supply : Infra orbital, anterior, middle and post
superior alveolar nerves.
