Table 4.3: Arterial Supply of the Eye and Orbit of the Domestic Pig, Sus scrofa Artery Origin Course Distribution From anterior surf of iICA, follows the ventral surface of Terminates by joining external Internal Ophthalmic iICA optic nerve to exit cranium through optic foramen. ophthalmic artery. Next vessel downstream from the buccal, from superficial surface of MA, coursing in parallel with posterolateral margin of pterygoid crest. At F'OR passes branch to CR. Receives int. ophth. Near this intersection arise the ciliary External vessels. Supplies eye, periorbital fat, and named branches to MA Eye, orbit, and adnexa. Ophthalmic extraocular muscles. Medial branch = external ethmoidal; enters nasal cavity thru ethmoidal foramina. Dorsal branch continues as supraorbital a., which enters frontal sinus cells but does not continue superficially. Rostrodorsal branches supply eyelid from medial aspect. From lateral continuation of EO; Courses lateral on ventral Lacrimal gland and lateral aspects Lacrimal Artery EO surface of supraorbital process. Terminates as lacrimal branch of upper and lower eyelids. and lateral palpebral vessels. Superior Palpebral EO via lacrimal Superior termination of lacrimal artery. Superolateral eyelid. Artery Inferior Palpebral EO via lacrimal Inferior termination of lacrimal artery. Inferolateral eyelid. Artery Originates from EO immediately distal to junction with int. Ciliary Trunk EO Posterior eyeball. oph. Supplies posterior globe of eye Central Artery of From ventral surf. ciliary a's, pierces dura and optic nerve to Ciliary Retina. the Retina reach retina. Dorsal termination of Malar artery; after coursing medially Frontal region medial to orbits; Dorsal Nasal Malar from the medial margin of the orbit, fans out over frontal and midline of caudal nasal region. nasal bones.