This section is from the book "Anatomy Of The Arteries Of The Human Body", by John Hatch Power. Also available from Amazon: Anatomy of the Arteries of the Human Body, with the Descriptive Anatomy of the Heart.
The Dorsalis Or Lateralis Nasi Artery, ascends obliquely inwards, and lies on the outer surface of the nasal portion of the levator labii superioris alaeque nasi muscle, and distributes its branches to the muscles, cartilages, and integuments of the nose; after which it anastomoses with the artery of the opposite side. Some of its minute branches pierce the fibro-cartilages to reach the mucous membrane. We often find the place of this artery supplied by a number of small branches; or, on the contrary, there may be a very considerable single branch, in which case the angular or terminating branch is particularly small.