DESCRIBE ANATOMY OF MAXILLARY ANTRUM (ANTRUM OF HIGMORE):
Maxillary antrum is the largest paranasal sinuses.
CAPACITY: 15ml (adult).
MEASUREMENT: 33 mm high, 35 mm deep, 25 mm wide.
DIRECTION: Base- towards lateral wall of nose. Apex- Laterally into the Zygomatic process of maxilla.
ANTERIOR WALL- Formed by facial surface of maxilla. Related to soft tissue of cheek.
POSTERIOR WALL- Related to Infratemporal & Pterygopalatine fossa
MEDIAL WALL- Related to middle & inferior meatus (Uncinate process, anterior & posterior frontanelle, inferior turbinate & meatus).
FLOOR- Formed by alveolar & palatine process of maxilla & is situated about 1cm below the level of floor of nose. Related to root of second premolar & 1st molar teeth.
ROOF- Formed by the floor of Orbit. Traversed by infraorbital nerve & vessels.
OSTIUM- High up in the medial wall. Opens in the post inferior part of ethmoidal infundibulum into middle meatus. Accessory ostium present behind main ostium in 30% cases.
FUNCTIONS OF NOSE: 1. Respiration. 2. Air conditioning of inspired air. 3. Protection of lower airway. 4. Vocal resonance. 5. Nasal reflex function. 6. Olfaction.
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