They are thought to act as resonance chambers during speaking. They may also function to lighten the bones of the facial part of the skull. The predominant supply is from benches of the sphenopalatine artery. Afterleaving the sphenopalatine foramen, the sphenopalatine artery divides into a lateral nasal branch, supplying the conchae, a posterior septal branch to the septum, and greater and lesser palatine arteries, which supply the hard and soft palates, respectively. In addition, th nasal cavity receives arterial blood from anterior ethmoidal branches of the ophthalmic artery that course medially out of the orbit, and branches of the super labial artery which enter from the face.
Venous blood leaves the region in veins that course alongside the arteries.
These drain into the facial, ophthalmic, and sphenopalatine veins. The latter vein form part of the pterygoid plexus of veins in the infratemporal fossa. The lyphatic drainage of this region is not well-known. Lymphatic vessels from the nasal region end in deep cervical lymph nodes. The nasal cavities receive both sensory and visceral innervation.