One of the airspaces that form the paranasal SINUSES within some of the frontal bones of the skull. These sinuses are lined with mucous membrane and open into the nasal cavity.
| 单词 | Frontal Sinus |
| 释义 | One of the airspaces that form the paranasal SINUSES within some of the frontal bones of the skull. These sinuses are lined with mucous membrane and open into the nasal cavity. |
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