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Cavities and spaces of the skull, paranasal sinuses, opening in the ...

Cavities and spaces of the skull, paranasal sinuses, opening in the ...

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Anteriorly<br />

Frontal s<strong>in</strong>us<br />

Piriform<br />

aperture<br />

Superior nasal<br />

meatus<br />

Middle nasal<br />

meatus<br />

Inferior nasal<br />

meatus

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