The frontal sinus occupies the dorsal part of the skull medial to the orbit. It overlaps cranial and nasal cavities and is often referred to as the conchofrontal sinus.
Comment:
[taxon-note] "A unique feature in the horse is that the frontal sinus communicates with the caudal maxillary sinus via the frontomaxillary opening" xsd:string {source="MURDOCh"}