<prompt> All open into hiatus semilunaris exceptPosterior ethmoid sinusAnterior ethmoid sinusFrontal sinusMaxillary sinus  <response>: Hiatus semilunaris. The hiatus semilunaris is a semicircular shaped openinglocated on the lateral wall of the nasal cavity. It is a component of the ostiomeatal complex and serves as the opening for the frontal and maxillary sinuses and the anterior ethmoid air cells. 