Study of the Distribution of Retinal Blood Vessels in Buffaloes(Bos bubalis).

Abstract

ABSTRACT. The distribution of retinal blood vessels in the eye of buffalo was studied macroscopically and microscopically in twenty-two eyes of healthy animals. After macroscopic observation, 12 of 22 eyes were used for histological study. Ten eyes were stained with hematoxylin and eosin and two eyes with PAS stain. The present findings revealed that the eye of the buffalo was characterized by the complex network of retinal blood vessels (holangiotic or euangiotic). The central retinal artery and vein pierced the eye through the optic disc and gave off several branches. There were four pairs of primary vessels that were named dorsal, ventral, nasal and temporal retinal arteries and veins. The veins anastmosed with each other at the optic disc to form a somewhat circle. Three patterns of the distribution of blood vessels were described. The distribution of the arteries and veins was the same. KEY WORDS: buffalo, retinal blood vessel.

The Central Retinal Artery and Regression of the Hyaloid Artery in Perinatal Cattle

“…There are four well‐defined configurations: (1) a compact network of intraretinal blood vessels found in a vast majority of the light‐sensitive component (euangiotic or holangiotic pattern, in domestic ruminants, pigs and carnivores), (2) retinal vessels that are confined to a small horizontal segment of the retina (merangiotic pattern, in the rabbit), (3) tiny retinal vessels restricted to the surroundings of the optic disc (paurangiotic pattern, in the horse and guinea‐pig) and (4) a completely avascular retina (anangiotic pattern, in birds). This study demonstrated that the retinal arterioles of the Zavot‐bred cattle formed a compact network on the light‐sensitive areas of the retina (euangiotic or holangiotic pattern), as was the case of the study by Kassa and Sugita (2001) in buffaloes, which also belong to the Bovidae family.…”

“…Several studies have indicated that retinal vascular patterns in domestic animals are present in a variable topographic arrangement (De Schaepdrijver et al., 1989; Simoens et al., 1996; Kassa and Sugita, 2001). There are four well‐defined configurations: (1) a compact network of intraretinal blood vessels found in a vast majority of the light‐sensitive component (euangiotic or holangiotic pattern, in domestic ruminants, pigs and carnivores), (2) retinal vessels that are confined to a small horizontal segment of the retina (merangiotic pattern, in the rabbit), (3) tiny retinal vessels restricted to the surroundings of the optic disc (paurangiotic pattern, in the horse and guinea‐pig) and (4) a completely avascular retina (anangiotic pattern, in birds).…”

“…After birth, the function of the hyaloid artery is no longer needed and the vessel regresses because the ciliary body starts actively producing aqueous humour circulating and nourishing the lens. Knowledge on the regression process of the hyaloid artery after birth in domestic ruminants is documented only in few literature reports (Simoens and Ghoshal, 1981; Kassa and Sugita, 2001). Munroe (2000), however, revealed and documented in detail the process of the regression of the hyaloid apparatus in horses.…”

“…Even though several studies on the arterial blood supply of the retina and lens have been reported in both fetal and postnatal stages of a variety of species (Simoens and Ghoshal, 1981; Simoens et al., 1996; Isomura et al., 1997; Imada et al., 2003), very limited data on the regression of the hyaloid artery of domestic bovines are present in literature reports (De Schaepdrijver et al., 1989; Kassa and Sugita, 2001).…”

Light and electron microscopic structure of goat's retina

“…The point of transition from the photosensitive portion to the non photosensitive portion is called ora ciliaris retinae in domestic animals and ora serrata in human (Banks, 1993). In the available literature, it has been found that the structure of the eyeball studied in many species of animals including some laboratory animals as Geunia pigs (Spira -Milman, 1979), rats (Smell et al, 1987), ferrets (Braekevelt, 1982), mouse (Carter-Dawson and lavil, 1979) and rabbits (Mills and Massey, 1992); pet animal as dogs (Miyake et al, 2004) and cats (Braekevelt, 1990) and domestic animals as horse (Altuny, 2000), camels (Derbalah, 2001), cattle (Altuny, 2004), buffaloes (Kassab and Sugita, 2001), sheep (Nilsson et al, 1973 a,b). The goats received a little attention of the researchers.…”