An artery on the side of the nose.  Supply sources include ophthalmic, facial (angular branch), infraorbital

Here is one from ophthalmic (dorsal nasal artery = 82 in “Diagrams and Drawings” scheme) — big artery to the nose

Anaglyph stereo

DYNA axial MIPs — 82 is dorsal nasal, 67 is anterior ethmoid — supplying  anterior  septum (65)

Angio — the more anterior one is dorsal nasal

Stereo frontal views — cross eye