Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Frontal sinus
Introduction
The frontal sinuses, situated behind the superciliary arches, are rarely symmetrical, and the septum between them frequently deviates to one or other side of the middle line.
Their average measurements are as follows: height, 3 cm.; breadth, 2.5 cm.; depth from before backward, 2.5 cm.
Each opens into the anterior part of the corresponding middle meatus of the nose through the frontonasal duct which traverses the anterior part of the labyrinth of the ethmoid. These structures then open into the hiatus semilunaris in the middle meatus.
The mucuous membrane in this sinus is innervated by the supraorbital nerve and supplied by the supraorbital artery and anterior ethmoidal artery.
Absent at birth, they are generally fairly well developed between the seventh and eighth years, but only reach their full size after puberty.
Additional images
Additional images
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Frontal bone. Inner surface. -
Medial wall of left orbit. -
Lateral wall of nasal cavity. -
Sagittal section of nose mouth, pharynx, and larynx. -
Outline of bones of face, showing position of air sinuses.
