Читать книгу Essentials of Veterinary Ophthalmology - Kirk N. Gelatt - Страница 63

Among domestic animals, the main supply of blood to the eye and orbit is via the internal maxillary artery (a branch of the external carotid artery), which after passing through the alar canal branches to give rise to the external ophthalmic artery. By comparison, in primates, the entire microcirculation of the eye and most of the orbital circulation are supplied via the internal carotid artery, which gives rise to the internal ophthalmic artery.

Domestic species possess both internal and external ophthalmic arteries, but the external ophthalmic artery provides most of the circulation to the eye. Both the long and short posterior ciliary arteries as well as the lacrimal, muscular, and supraorbital arteries derive from the external ophthalmic artery. The internal ophthalmic artery, which is relatively small, provides the blood supply for the optic nerve and anastomoses with the external ophthalmic artery or one of its branches; this anastomosis is especially prominent in the dog.