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| | The glandular system of Schistosoma iapoonicum cercariae consists of 3 different types of large unicellular glands, namely, one head gland located in the centre of head organ and 10 glands positioned around the acetabulum. The ten glands are in two sets, each set consisting of two pre-acetabular glands and three post-acetabular glands. The ducts of the glands are joined into two duct bundles which run anteriorly and become narrow. Each bundle of five ducts is encompassed by two layers of muscle. The extrac... | | 通过电镜观察发现:日本血吸虫尾蚴的头腺为多导管的单细胞腺,由腺体部和若干突起状的短导管构成,其分泌小体呈圆形或卵圆形,平均大小为 0. 29 × 0. 23μm,具有同心的环层膜状结构。前钻腺含有 A、B两型分泌小体。 A型分泌小体近似圆形,平均大小为 0. 46× 0. 32μm,基质为电子致密的均 匀结构;B型分泌小体数量众多,略呈不规则的圆形,平均大小为1.02×0.82μm,基质为中等电子致 密并含十余个小圆形的电子透亮区。后钻腺含有椭圆形或长条状的分泌小体,平均大小为0.97×0.62μm,基质呈同质性,或伴有电子密度较深的圆形聚集物,或基质呈泡沫状。每根钻腺导管 的胞质外周具有许多沿导管长轴纵行的微管结构,在导管周围有纤维性网状构造包绕,起着对细长导管的支架作用。在导管束外周又有大量肌纤维包统而形成的鞘状结构,它对管内分泌小体的排出可能具有选择性控制作用。 | | 文摘来源 | | Objective To make a comparison of indwelling transfusion effect between via external jugular vein and via limbs’peripheral vein for critical patients via, and seek for a better way to creating the venous pass.MethodsA total of 203 patients were divided into two groups at random. Group A (n=103) was infused with indwelled needle in external jugular vein, and Group B (n=100) was infused with indwelled needle in limbs’peripheral vein. Many indexes were observed and compared between the two groups, such as time... | | 目的在抢救危重病人时为快速建立静脉输液通道,比较颈外静脉与四肢浅静脉留置针输液效果。方法203例危重病人,103例应用颈外静脉留置针穿刺术,100例应用四肢浅静脉留置针穿刺术,然后比较两者的穿刺所需时间、一次穿刺成功率、液体通畅良好度、液体最大流速、收缩压升高到80mmHg所需的平均时间、导管脱出、液体渗漏、置管保留时间及静脉炎发生率。结果颈外静脉组明显优于四肢浅静脉组,P<0.01。结论颈外静脉穿刺具有穿刺所需时间短、一次穿刺成功率高、液体通畅良好、液体流速快、收缩压回升到80mmHg所需的平均时间短、导管不易脱出、液体不易渗漏、置管保留时间长及静脉炎发生率低等优点。能为危重病人的抢救赢得时间。 | | 文摘来源 | |   |
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