Anatomy of Paranasal sinuses

Paranasal sinuses. Sinus paranasales

Maxillary sinus. Sinus maxillaris. Situated below the orbit and lateral to the nose, it opens below the middle nasal concha.

Sphenoidal sinus. Sinus sphenoidalis. Paired sinus within the sphenoid bone behind the sphenoethmoidal recess and above the nasopharyngeal cavity; it opens into the sphenoethmoidal recess.

Frontal sinus. [[Cellulae ethmoidales]]. Sinus frontalis. Sinus in the squama of the frontal bone and often also in the orbital part, it opens below the middle concha.

Ethmoidal sinus. Sinus ethmoidales. System of cavities with pea-sized air cells between the nasal cavity and orbit. It is divided into the following parts.

Anterior sinus. Sinus anteriores. Anterior group of ethmoidal air cells which opens below the middle nasal concha

Middle sinus. Sinus medii. Middle group of ethmoidal air cells which opens below the middle nasal concha.

Posterior sinus. Sinus posteriores. Posterior group of ethmoidal air cells which opens below the superior nasal concha.
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