Читать книгу Essentials of Veterinary Ophthalmology - Kirk N. Gelatt - Страница 47

The extensive blood supply of the ciliary body is derived from the two long posterior ciliary arteries and the anterior ciliary arteries. As the long posterior arteries pass into the suprachoroidal space equatorially along the lateromedial horizontal plane, they undergo several divisions. These divisions anastomose anteriorly with branches of the anterior ciliary arteries to form the major arterial circle, which is located either in the base of the iris or in the anterior ciliary body. The anterior ciliary arteries, which arise from branches of the ophthalmic artery, typically enter the globe at the attachment sites for the recti muscles and help to supply the ciliary muscles. The major arterial circle is the primary vasculature supply of the ciliary processes.

Numerous anatomical variations of this vasculature have been found among mammals. The mammalian ciliary body muscle is supplied by parasympathetic fibers from the oculomotor nerve and by sympathetic nerve fibers. The parasympathetic fibers leave the oculomotor nerve, penetrate the ventral oblique muscle, and synapse in the ciliary ganglion. From the ciliary ganglion, short ciliary nerves penetrate the sclera around the optic nerve to pass into the sclera and suprachoroidal space innervating the ciliary muscle and iris muscles. The sympathetic fibers arrive via the long ciliary nerves from the dorsal or superior cervical ganglia in a similar manner.