Figure 52-5. Innervation and blood supply of the right nasal cavity. A shows the main nerve territories on the lateral wall: those on the medial wall are similar. Apart from the olfactory region, the chief innervation of the nasal cavities is from the ophthalmic and maxillary nerves, the latter by way of the pterygopalatine ganglion. B and C show the nerves in the lateral and medial walls, respectively. D shows the main arterial territories on the medial wall: those on the lateral wall are similar. On the nasal septum, a septal branch of the superior labial artery (from the facial) and septal branches of the sphenopalatine artery anastomose near the point X, which is the chief site from which bleeding from the nose occurs. Click for high resolution image.