老年人视网膜中央血管在前部视神经的解剖特征

LUMINAL CHARACTERISTICS OF THE AGED CENTRAL RETINAL VESSELS IN THE ANTERIOR OPTIC NERVE

目的：观察老年人前部视神经内视网膜中央血管的解剖特征。方法：通过组织连续切片和计算机影像分析，观察６０～８２岁老年人的１８只眼球标本中无解剖变异的视网膜中央动脉（ＣＲＡ）１５条，视网膜中央静脉（ＣＲＶ）２３条在筛板前、筛板区及筛板后的管径变化。结果：老年人筛板前、筛板区、筛板后ＣＲＡ平均面积的均值分别为（１２．７０，１７．４０，１８．００）×１０－３ｍｍ２；平均周长的均值分别为０．５６，０．５６，０．５７ｍｍ，平均周长之间相比无显著差异。ＣＲＶ平均面积的均值分别为（７．００，５．４０，７．９０）×１０－３ｍｍ２；平均周长的均值分别为０．４４，０．３８，０．４１ｍｍ；ＣＲＶ平均周长筛板前与筛板区相比，筛板区与筛板后相比均有显著差异。结论：老年人ＣＲＡ眼球内外管径一致；ＣＲＶ在筛板区管径最小。

PURPOSE:To evaluated the luminal characteristics of the elderly central retinal vessels in the anterior optic nerves.METHODS:Serial sections of 15 central retinal arteries(CRA)and 23 central retinal veins(CRA)of 18 eyes of the aged 60 to 82 years old without anatomic malformation were examined by image analysis to investigate their luminal dimensional differences at the sites of lamina cribrosa and just anterior and posterior to it.RESULTS:The average values of the mean area of the CRA in the prelaminar,laminar,retrolaminar portions were separately (12.70, 17.40, 18.00)×10-3mm2 and the mean perimetric length 0.56, 0.56, 0.57mm.No significant difference was detected in these three sites.The average values of the mean area of the CRV were respectively (7.00, 5.40, 7.90)×10-3mm2 and the mean perimetric length 0.44,0.38,0.41mm.There were marked differences between the prelaminar value and the laminar one,and between the laminar value and retrolaminar one by comparison.CONCLUSION:The CRA has a uniform radius from prelaminar to retrolaminar positions,and tube radius of the CRV at the level of the lamina cribrosa is the least.