By Tsugio Amemiya M.D., Ph.D. (auth.)
Retinal and choroidal vasculatures are simply plagued by a variety of systemic ailments, and alterations within the retina can simply be saw with quite a few methods equivalent to direct and oblique ophthalmoscopy, scanning laser ophthalmoscopy, fluorescein fundus angiography, and indocyanin eco-friendly fundus angiography. Vascular adjustments are the key, so much favorite, and most crucial fundus adjustments. The above-mentioned methods can display vascular alterations basically, yet in most cases exhibit adjustments within the superficial layer of the retina. additionally, those strategies can't convey the three-d structure of the retina. often we will slightly receive the view of that 3 dimensional structure. while, pathological findings are good defined, yet so much of them are in line with histological and cytological tools. hence, three-d description of pathology is uncommon. Vascular corrosion solid scanning electron microscopy offers a really helpful third-dimensional view of the microvasculature and will exhibit the wonderful structural structure of the capillary community. despite the fact that, the applying of this system to the retinal and choroidal vasculature is particularly tough, in particular in small eyes. We succeeded in making solid corrosion casts of retinal and choroidal vessels within the rat. utilizing this system up to now 10 years we now have tested the retinal and choroidal vascular structure of rats with a variety of systemic ailments akin to getting older, high blood pressure, diabetes mellitus, and arteriosclerosis.
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Extra info for Retinal and Choroidal Vascular Changes and Systemic Diseases in Rats: Corrosion Cast and Scanning Electron Microscopy
Example text
Amemiya Fig. 12. SEM micrograph of vortex vein (Vv) of an 18-month-old WKy rat. The collecting venules converging into the vortex vein are numerous and regularly arranged Ueda, Tokyo, Japan) without anesthesia. Serum cholesterol levels were determined by atomic absorption spectroscopy. Blood sugar levels were measured using the Advantage Test Strip II (Yamanouchi Pharmaceutical, Tokyo, Japan). Light Microscopy for Determination of Arteriosclerotic Lesions To confirm arteriosclerosis we examined the ascending aorta of 12- and 18month-old RICO (n = 6) and WKy rats (n = 6).
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The capillaries were fairly uniform in caliber, and branched frequently, and interconnected freely to form a network with smaller intercapillary meshes. The irregular pattern of intercapillary meshes was wider and longer than the honeycomb pattern (Fig. 9). In the peripheral area, the irregular pattern was less dense and more extensive (Fig. 08 ~m n = 36) than in the posterior pole and the peripapillary area. In addition, in the peripheral area of the choriocapillaris, horizontal lines of vascular dilatations between capillaries were sometimes observed (Fig.