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用血管墨汁灌注后组织切片法和组织透明法、血管铸型扫描电镜观察、血管X线造影、标本显微解剖、眼动脉局部灌注和扫描电镜观察视交叉表面血管,对88例人体视交叉血液供应解剖进行了研究,发现血供主要来自大脑前动脉和颈内动脉分支;前、后交通动脉和大脑中动脉的分支也参与血供,并在视交叉前角和下部漏斗周围互相吻合,形成视交叉前吻合网和漏斗周围吻合网。颈内动脉另有2~3个分支迂曲向内,从外侧达视交叉侧缘表面的软脑膜,不组成前述的两个吻合网,可籍以解释视交叉正中部肿瘤无损于双鼻上视野的原因. 相似文献
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垂体腺瘤在内分泌科是一种常见病 ,因为他有一系列内分泌失调的阳性体征 ,诊断并不困难。但无功能性垂体腺瘤则很少出现内分泌失调等症状 ,尤其是年龄较大的患者 ,内分泌症状已不明显 ,常常不引起医师及患者的注意而漏诊。鞍区肿瘤位于视交叉和视神经附近 ,常首先出现视力障碍而就诊于眼科 ,由于合并存在眼部其他病患 ,而忽略了对视路疾病应有的检查 ,本文报道 2例均以白内障解释视力下降 ,而漏诊了鞍区肿瘤。1 临床资料例 1:患者 ,女 ,62岁 ,1995年 10月 13日就诊眼科 ,主诉双眼视力减退 3月余 ,视力右 0 .9,左 0 .0 8,双前节正常 ,晶状体… 相似文献
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一眼来自视网膜鼻半侧的视神经纤维在视交叉处交叉到对侧,与来自对侧眼视网膜的颞半侧纤维会合组成视束,从此往上视道经过外侧膝状体、视放射直到视皮质;因此,视交叉以上视道的任何一段的病损,均将出现双眼在病灶的对侧半视野不同程度的缺损, 相似文献
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视野分析器(Friedmann Visual FieLd analyser)是一个多点静态定量的视野检查计,供中心25°内视野检查,它已在许多国家广泛应用。基本原理与量群视野计相似。我科自1980年以来,在正常人核试之后,已用FVFA(英国产)于黄斑部病变,青光眼以及神经系疾患等病例数百人中使用,认为它操作方便,结果较确切可靠、在繁忙的临床工作中较为适用。故作介绍如下: 相似文献
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In 190 1,Taylorreportedthefirstcaseofaspinalcordtumorassociatedwithpapilloedema ThetumorwasattheC3level ArseniandMaretsisreviewed 2 89casesofspinalcordtumor (1935- 196 5) ,andfoundonly 3casesassociatedwithpapilloedema 1 Matzkin 1992reviewed 53casesofspinaltumorassociated… 相似文献
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The blood supply system of the optic chiasma was studied in 85 fresh human specimens using varios histolog-ical and anatomical methods.Computer image analysis and ultrastructural examinations of the microvessel in 58 fetal specimens were also conducted.The authors found that the medial portion of the chiasma is a weak point in the microcirculation network.This weak point is apt to be disturbed first and become ischemic,causing disorders of the crossing optic nerve fibers and resulting in characterestic bitemporal visual field defects.SEM studies showed no ultrastructural difference between the capillaries at the medial and lateral portions of the chiasma.It was concluded that:1)No special artery supplies the median chiasma the weak point of microcirculation at the median chiasma is due to its relatively scanty capillary distribution;2)“lateral chiasma arteries”could provide a better blood supply to the lateral fibers and thus the nasal quadrantic visual field could be preserved in many late stages of visual field defect in sellar region tumors;3)cases with pituitary microadenoma which is mot sufficiently large to press the chi-asma but involves bitemporal visual field defect are due to the tumor recieving“shunt-flow”(stealing blood)from the chiasma through the peri-infundibulum plexus. 相似文献
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目的对颅脑外伤后,眼部表现基本正常的病人,设法寻找眼球后的视道有无损害。协助病灶的定位与诊断。方法:作全面的眼部检查,视野测试,及颅脑影像检查。结果就诊眼科时,6例中除1眼外,其余所有11眼的眼前段及眼底均正常,视力也在0.8至1.5,但视野检查时均发现了视道上段视纤维受损,所见视野缺损均与CT及X线所见的颅脑损伤处相符应。结论本文强调视野检查对颅脑外伤病人是否有视功能的损丧的重要性 相似文献