2 The sphenoid sinuses are situated within the body of the sphenoid bone. They open out into the nasal cavity in an area supero-posterior to the superior cocha - known as the spheno-ethmoidal recess.

@@medicobuddies3124 Hii Please tell Ans of MCQ Q.IT IS OPEN DIRECTLY TO THE SUPERIOR NASAL MEATUS 1 frontal sinus 2 sphenoid sinus 3 maxillary sinus 4 anterior cells of the ethmoidal sinus 13. BONE THAT LIMITS THE PIRIFORM APERTURE OF THE NOSE 1 the zygomatic 2 the ethmoid 3 the lacrimal 4 the maxilla 14. BONE THAT TAKES PART IN FORMATION OF THE NASAL SEPTUM 1 the vomer 2 the maxilla 3 the nasal 4 the frontal 15. ORAL CAVITY IS CONNECTED WITH THE NASAL CAVITY BY 1 the choanae 2 the incisive canal 3 the facial canal 4 the zygomatic canal 16. FORMATION THAT OPENS TO THE MIDDLE NASAL MEATUS 1 the incisive canal 2 the posterior cells of the ethmoidal labyrinth 3 the aperture of the sphenoid sinus 4 the maxillary sinus 17. FORMATION THAT OPENS TO THE SUPERIOR NASAL MEATUS 1 the nasolacrimal canal 2 the aperture of the sphenoid sinus 3 the maxillary sinus 4 the frontal sinus 18. FORMATION THAT OPENS TO THE INFERIOR NASAL MEATUS 1 the nasolacrimal canal 2 the sphenoid sinus 3 the maxillary sinus 4 the ethmoidal labyrinth 19. ORBITAL CAVITY IS CONNECTED WITH THE INFRATEMPORAL FOSSA BY 1 the superior orbital fissure 2 the inferior orbital fissure 3 the nasolacrimal canal 4 the infraorbital canal 20. ORBITAL CAVITY IS CONNECTED WITH THE MIDDLE CRANIAL FOSSA BY 1 the superior orbital fissure 2 the inferior orbital fissure 3 the posterior ethmoidal foramen 4 the foramina of the cribriform plate