泥螺生殖系统的组织学研究   总被引：4，自引：0，他引：4  

应雪萍  陈鸟  华恩宠  付珞  王娴 《海洋学研究》2002,20(3):24-31

随机选取不同发育阶段的泥螺 ,活体解剖 ,取出其生殖系统 ,切成若干小段 ,按常规组织学方法制成切片 ,光学显微镜观察并拍照 ,对其生殖系统的组织学进行研究。结果表明 ,泥螺生殖系统由生殖器本部 ,交媾器和卵精沟三部分组成。生殖器本部包括两性腺、两性管、精囊、蛋白腺、粘液腺、缠卵腺、交媾囊、摄护腺。卵巢位于两性腺周围 ,精巢位于中间 ,并先熟先形成精子。生殖细胞成熟后经由单层上皮细胞组织的两性管排出 ,两性管末端的交媾囊为精卵受精的部位。交媾囊一侧的蛋白腺、粘液腺分别分泌蛋白质及粘液包围卵。交媾器包括刺激器与阴茎两部分 ,两者均由多层肌肉细胞组成。外卵精沟由皮肤凹陷而成 ,沟壁具纤毛。  相似文献   

三疣梭子蟹Y器、大颚器显微及超微结构研究   总被引：2，自引：0，他引：2  

秦昆  康现江  郭明申  穆淑梅  曾伟 《台湾海峡》2007,26(1):76-84

本实验对三疣梭子蟹的内分泌器官Y器、大颚器的显微及超微结构进行了研究．Y器位于前鳃腔、眼柄的后外侧．组织学特征：细胞紧密排列，核呈卵圆形，异染色质丰富，胞质极少，细胞界限不明显．超微结构特点：细胞核几乎占据了整个细胞，细胞突起多。细胞器少．管状嵴的线粒体、多层同心环状的滑面内质网以及高尔基体较为常见．大颚器位于大颚肌几丁质腱的后侧基部．组织学特征：细胞体积较大，核仁清晰。胞质染色均匀．超微结构特点：胞质丰富，质膜大量内陷和作不同程度的卷绕，内含大量具管状脊的线粒体和滑面内质网．  相似文献   

斑鳢皮肤的组织学观察     

郭素敏  林振滨  罗明庆 《广东海洋大学学报》1989,(Z1)

本文对斑鳢皮肤的细微结构进行光学和电子显微镜的观察。研究结果表明:斑鳢的皮肤由表皮、基膜、真皮和皮下组织构成。表皮主要由复层的被覆上皮细胞和粘液细胞组成,电镜显示,上皮细胞彼此用指状突起和桥粒相联接。粘液细胞的内含物有三种不同形态,它们是处在不同功能时期的不同形态表现。真皮由稀疏层和致密层构成,其中细胞种类较多,结构复杂。真皮借基膜与表皮相联。电镜显示,基膜含有微丝状结构。皮下组织主要含胶原纤維,在与肌肉交界处,纤維向肌束间延伸。  相似文献   

The Last Pterosaurs: First Record from the Uppermost Maastrichtian of the Tremp Syncline (Northern Spain)     

DALLA VECCHIA Fabio M.  RIERA Violet  OMS Josep Oriol  DINARèS-TURELL Jaume  GAETE Rodrigo  GALOBART Angel 《《地质学报》英文版》2013,87(5):1198-1127

Pterosaur bones are for the first time reported from the Tremp Syncline(Spain) and the southern Pyrenees.They come from the Torrebilles-2 site(Isona,Lleida Province) in the upper Maastrichtian part of the Tremp Formation,which falls within the C29r magnetochron.Fragmentary long bones are referred to the Pterosauria based on their cortical thinness,micro-architecture,and histological features.They belong to very large to possibly giant individuals.The most complete specimen is possibly a partial right femur.The review of the Maastrichtian pterosaur record shows that only a few specimens can be referred to the C29r(which contains the K/Pg boundary).The identification of fragmentary remains could improve our knowledge about the abundance and distribution of these flying sauropsids just before the end-Cretaceous mass extinction.  相似文献   

青弹涂鱼卵巢发育的组织学研究     

曹伏君 《热带海洋学报》2009,28(6):123-129

目前关于青弹涂鱼（Scartelaos virids）的研究多数集中在胚胎和仔鱼发育等个体生物学研究上。本文研究广东省湛江海域中青弹涂鱼在性周期内卵母细胞的发育时相及卵巢结构的周年变化，揭示卵巢发育和卵母细胞的组织学发育规律。结果表明：湛江海域的青弹涂鱼卵母细胞在3月进入大生长期发育阶段，4—6月为繁殖盛期，7—8月为繁殖末期，10月卵巢基本修整完毕，进入Ⅱ恢复期。青弹涂鱼属于一次性产卵类型。在小生长期，卵核的体积较核质的体积增大快，核质比大；大生长期，随着卵黄物质的积累，卵母细胞体积快速增加，核质比下降。最后讨论青弹涂鱼卵膜结构及其生理机能，围核透明层，繁殖习性等问题。  相似文献   

Histological Study on the Digestive System Development of Takifugu rubripes Larvae and Juvenile   总被引：1，自引：0，他引：1  

WAN Zhenzhen GAO Tianxiang ZHANG Xiumei CHEN Chao YU Changhong 《中国海洋大学学报(英文版)》2006,5(1):39-44

The digestive tract of Takifugu rubripes during early life stages was studied with light microscopy. At the beginning of hatching, the digestive tract is represented by a simple and undifferentiated straight tube and does not communicate with the exterior, as the mouth and anus are not open yet. At 2 d after hatching, a constriction between intestine and rectum that will become the intestino-rectal valve is visible. During the endogenous feeding phase, the yolk sac is resorbed and the digestive tract becomes functional and differentiated. The liver and pancreas also become apparent at this time. At onset of exogenous feeding （3 d after hatching）, yolk sac resesves are not completely depleted, suggesting a period of mixed nutrition. The digestive tract differentiates fully into b.uccopharynx, esophagus, stomach, intestine and rectum. At 9 d after hatching, the yolk sac reserves are completely depleted. The most noticeable events occurring from 5 to 17 d after hatching are the transformation of the epithelia type, the differentiation of the pneumatic sac, the epithelial cell, gut convolution, mucosal fold increase, and the growth of liver and pancreas. From 18 to 27 d after hatching, the numbers of intestine folds and mucus cells increase progressively. From then on, morphological changes of digestive features are almost completed. At 27 d after hatching, the morphology and function of digestive system are similar to that of the adult.  相似文献   

Histological study on the skin of Japanese flounder <Emphasis Type="Italic">Paralichthys olivaceus</Emphasis>     

ZHUJie ZHANGXiumei GAOTianxiang 《中国海洋大学学报(英文版)》2005,4(2):145-151

Histological development of Japanese flounder Paralichthys olivaceus larval skin and ultrastructural difference of skin between reared normal and malpigmented Japanese flounder were studied with light microscopy (LM) and transmission electron microscopy (TEM). The results show that the skin develops slowly before the metamorphosis, while at the onset of metamorphosis, the skin develops quickly and becomes complete in structure till about 50d after being hatched. Ultrastructural observation on the normal and malpigmented skins shows that the iridophore and melanophore are adjacent to each other. Profile and structure of the two kinds of pigmcnt cells are more complete in the skin of normal ocular side than in the skin of pigmented blind side. The ultrastructure of typical chloride cell was observed in the skin of Japanese flounder larvae for the first time.  相似文献   

牙形石动物分类归属研究新进展—牙形石是最早的脊椎动物   总被引：4，自引：0，他引：4  

赖旭龙 《地质科技情报》1995,14(4):49-56

在简要回顾牙形石动物分类位置研究历史的基础上，主要介绍了近十年来这一问题的最新研究成果。英国古生物学家们通过牙形石动物的软体解剖学研究，发现眼睛、脊索、神经索、肌肉组织、尾鳍等软组织；牙形石分子硬体组织学研究揭示了细胞状骨骼、球状钙化软骨、类珐琅质及牙质等硬组织。新的证据表明牙形石动物是脊椎动物，从而将脊椎动物的历史向前推移了４０～５０Ｍａ。  相似文献   

大弹涂鱼雌性性腺发育研究   总被引：5，自引：0，他引：5  

谢湘筠  张其永 《台湾海峡》1990,(3)

根据性腺组织学观察,对雌性大弹涂鱼卵细胞发育的5个时相作了形态特征的描述和探讨,并将其卵巢划分为6个发育期。本文还观察到第4时相晚期外卵膜上的丝状物,并对产卵类型作了阐述。  相似文献   

文蛤(Meretrix meretrix Linnaeus)外套膜的组织学与组织化学研究   总被引：2，自引：0，他引：2  

任素莲  张艳艳  宋微波 《中国海洋大学学报(自然科学版)》2003,33(5):701-706

利用组织学和组织化学染色方法对文蛤外套膜进行了研究。结果表明 ,文蛤外套膜具有双壳贝类外套膜的典型结构特征 ,即由中央膜与边缘膜组成 ,边缘膜具有 3个突起。组织结构包括内外上皮层、结缔组织与肌纤维。不同部位的外套膜 ,其上皮细胞的形态结构、结缔组织与肌纤维含量等有差异。上皮细胞与结缔组织中分布有几种不同类型的粘液分泌细胞。组织化学研究结果显示 ,缘膜突起上皮细胞内含有丰富的糖类。分泌细胞内含物中含有丰富的糖类和少量的 RNA,同时在分泌细胞检测到较强的 ACP酶活性  相似文献