Posterior septal branches of sphenopalatine artery

Crossing the under surface of the sphenoid the sphenopalatine artery ends on the nasal septum as the posterior septal branches; these anastomose with the ethmoidal arteries and the septal branch of the superior labial; one branch descends in a groove on the vomer to the incisive canal and anastomoses with the descending palatine artery.

References

This article incorporates text in the public domain from page 562 of the 20th edition of Gray's Anatomy (1918)