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The Arterial Supply of the Eye of the Yak (Bos Grunniens)

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The Arterial Supply of the Eye of the Yak (Bos Grunniens) 中国科技论文在线 Research in Veterinary Science 84 (2008) 174–177 http://www.paper.edu.cn The arterial supply of the eye of the yak (Bos Grunniens) Bao-Ping Shao a, Yan-Ping Ding a, Shi-Yaun Yu b, Jian-Lin Wang a,* a MOE Key Laboratory of Arid and Grassland Ecology, School of Life Sciences, Lanzhou University, Lanzhou, Gansu 730000, PR China b School of Life Sciences, Northwest Normal University, Lanzhou, Gansu 730070, PR China Accepted 24 April 2007 Abstract The heads and necks of 10 yaks were dissected to study the arterial supply to the eye of the yak in the Qinghai-Tibetan Plateau. The supply came from the internal ophthalmic, external eight ophthalmic, superficial temporal and malar arteries. The internal ophthalmic was one of sources of the posterior long ciliary artery. The external ophthalmic artery gave rise to branches to supply the dorsal oblique muscle and otherwise, and to take part in the formation of the ophthalmic rete mirabile. The ophthalmic rete mirabile gave off many branches to supply the rectus muscles of the eye and otherwise. The malar artery was one of the branches derived from the infraorbital artery, and its branches supplied the inferior, superior and third eyelids and otherwise. The superficial temporal artery detached off some branches to supply the lateral angle of the eye and otherwise, and anastomosed with the lacrimal artery of the ophthalmic rete mirabile. Ó 2007 Published by Elsevier Ltd. Keywords: Yak; Eye; Arterial supply; Qinghai-Tibetan Plateau; Ophthalmic rete mirabile 1. Introduction mal, it is necessary to define the arterial supply to its eyes. Hideki et al. (2003) studied the blood supply to the retina The yak (Bos grunniens) is an important domestic ani- and the lens in the gerbil of both sexes from infancy to mal in some of the higher altitude areas of the world. It maturity. Wang (2002) studied the arterial supply to the was firstly domesticated about 4000 years ago in China eye of the Bactrian camel. Kanan (1972) observed the dis- where there are now more than 13 million yaks, making tribution of the external and internal ophthalmic arteries in up >90% of the world yak population. In the Qinghai- dromedary camel. Smuts and Bezuidenhout (1987) Tibetan Plateau, which is located about 3000–4700 m described some arteries that supply the eye of the drome- above sea level, the yaks provide a critical source of animal dary camel. Godinho and Getty (1975) described some products such as meat, milk and hides, etc. arteries that supply to the eye of the oxen. It is important to know the details of the arterial supply No reports describing the arterial supply to the eye in the of the eye of the yak to explore the morphological charac- yak have been published. The aim of the present study was teristics of the plateau animal. The eye is the visual organ to describe the origin, course and branches of the arteries of the vertebrate, the visual system is the most important that supply to the eye in the yak and to provide a morpho- sensory path, and approximately 80% of the outer informa- logical basis for further research on the adaptability of the tion enters brain through visual system. The yak can exist plateau animal, the comparative anatomy of the vertebrate in the Qinghai-Tibetan Plateau there is higher altitude and and the related clinical surgery of this domestic animal. less oxygen, the arterial supply of the eye plays an impor- tant role. So in studying the adaptability of the plateau ani- 2. Materials and methods Abbreviation: A, arteria. Ten heads (cut above the second cervical vertebra) from * Corresponding author. Tel./fax: +86 931 8914075. adult yaks were collected from the Second Yak Slaughter- E-mail address: [email protected] (J.-L. Wang). house, Datong, Qinghai, China, after the animals had been 0034-5288/$ - see front matter Ó 2007 Published by Elsevier Ltd. doi:10.1016/j.rvsc.2007.04.019 转载 中国科技论文在线 http://www.paper.edu.cn B.-P. Shao et al. / Research in Veterinary Science 84 (2008) 174–177 175 killed by exsanguination for food. The specimens were fixed within 24 h of death by infusing them with 10% for- malin through the common carotid artery. After the spec- imens had been fixed for five to seven days, the specimens were then colored by injecting a solution of the red oils in ether (15:1) into the common carotid artery. All the animals were adults, but the sex and weight were not recorded. After again the specimens had been stored for one week, both sides of each specimen were carefully dissected to observe the origin, course, situations arrange- ments and branches of the arteries supply to the eye, fol- lowing the procedures described by Xie (1987), Li (1995) and Godinho and Getty (1975). 3. Results The arterial supply of the eye of the yak came from the Fig. 2. Arterial blood supply to the right eye of the yak; lateral view. A. Supraorbital canal; B. Ethmoidal foramen and C. Optic nerve: (1) Carotid internal ophthalmic, external ophthalmic, superficial tem- artery; (3) External ophthalmic artery; (4) Ophthalmic rete mirabile; (5) poral and malar arteries. Supraorbital artery; (6) External ethmoidal artery; (7) Maxillary artery; (16) Posterior short ciliary artery; (17) Buccal artery; (18) Lacrimal artery. 3.1. Internal ophthalmic artery The internal ophthalmic artery (Fig. 1) arose as a branch of the rete chiasmaticum. The artery left the rostral epidu- ral rete mirabile near the optic foramen and accompanied the optic nerve ventrally in the orbital fossa, where it joined with the branches of the external ophthalmic artery. The communicating branch was as a source of the posterior long ciliary artery (A. ciliaris longus posterioris lateralis). 3.2. External ophthalmic artery (A. ophthalmica externa) The external ophthalmic artery (Figs. 1–3) arose from the dorsal wall of the maxillary artery following the origin Fig. 3. The deep arterial blood supply to the right eye of the yak; lateral of the buccal artery, at the level of the foramen orbitoro- view: (1) Carotid artery; (2) Superficial temporal artery; (3) External tundun (Fig. 1). It crossed the maxillary nerve laterally ophthalmic artery; (4) Ophthalmic rete mirabile; (5) Supraorbital artery; (6) External ethmoidal artery; (7) Maxillary artery; (8) Descending palatine artery; (9) Infraorbital artery; (10) Malar artery; (11) Third palpebral artery; (12) External ophthalmic artery; (13) Medial posterior long ciliary artery; (14) Medial superior palpebral artery; (15) Medial inferior palpebral artery; (28) Lateral inferior palpebral artery; (29) Lacrimal branch; (30) Lateral superior palpebral artery. and entered the apex of the periorbita, where it gave off three branches, one entered the orbit with the ophthalmic nerve to form the ophthalmic rete mirabile, and the others took part in the formation of the rostral epidural rete (Figs. 1 and 2). From the ophthalmic rete mirabile arose to a common trunk for the supraorbital and external ethmoidal arteries (Figs. 1–3). After traversed the supraorbital canal, the supraorbital artery (A. supraorbitalis) do not gave off any branches in the orbit, and supplied the mucous mem- Fig. 1. Arterial blood supply to the right eye of the yak: medial view. D. brane of the frontal sinus and the musculature and skin lied Orbito-round foramen: (1) Carotid artery; (3) External ophthalmic artery; on the surface of the frontal bone directly (Figs. 1 and 2). (4) Ophthalmic rete mirabile; (5) Supraorbital artery; (7) Maxillary artery; (16) Posterior short ciliary artery; (18) Lacrimal artery; (19) Medial The external ethmoidal artery (A. ethmoidalis externa) was posterior long ciliary artery; (20) Central retinal artery; (21) Lateral the continuation of the external ophthalmic, which left the posterior long ciliary artery; (31) Internal ophthalmic artery. orbit through the ethmoidal foramen and entered the 中国科技论文在线 http://www.paper.edu.cn 176 B.-P. Shao et al. / Research in Veterinary Science 84 (2008) 174–177 cranial cavity. It supplied the ethmoidal bone, the caudal along the medial side of the optic nerve entered the eyeball nasal septum and the dorsal nasal conha. The external eth- from the posterior half of the eyeball and successively moidal artery gave off a branch from its origin, which ran extended in the sclera and the epichoroid space towards dorsally and cranially entered the periorbit to supply the the limbus of cornea. There were three posterior short cil- ventral rectus muscle. At the medial surface of the sheath iary arteries (Fig. 1), which supplied the choroid. The cen- of the eye, one branch went rostrally and laterally along tral retinal artery (A. retina centralis)(Fig. 1) originated the medial border of the dorsal oblique muscle entered from the ophthalmic rete mirabile with the lateral posterior the conjunctival coat of the superior eyelid to supply the long ciliary artery or with the medial posterior long ciliary medial rectus and dorsal oblique muscles, the conjunctival artery, ventral to the optic nerve, and entered the optic surface of the superior eyelid and the fat body of the orbit. nerve to extend toward the cribriform area in the center of the nerve to supply the choroid. 3.3. Ophthalmic rete mirabile (rete mirabile ophthalmicum) 3.4. The malar artery (A. malaris) The ophthalmic rete mirabile was formed by the branches of the external ophthalmic artery (Figs. 1–3). A The malar artery (Fig. 1) was large and arose by a com- small part of the ophthalmic rete mirabile lay laterally to mon trunk with the infraorbital artery (A. infraorbitalis)in the original 85 art of the dorsal and lateral rectus muscles, the rostral part of the pterygopalatine fossa near the max- while the main part lay between the retractor oculi muscle illary foramen (Fig.
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