Fairweather I, Threadgold L T
Parasitology. 1983 Feb;86 (Pt 1):89-103. doi: 10.1017/s0031182000057206.
The fine structure of the nervous system in the scolex and neck region of Hymenolepis nana has been investigated by transmission electron microscopy. A description of the gross neuroanatomy in these regions of the worm is presented. The ganglia, commissures and nerve cords consist of an incomplete cortex of nerve cell bodies, and a core of nerve fibres. A delimiting sheath or capsule is absent. The nerve cell bodies contain a single nucleus with a single nucleolus, mitochondria, many ribosomes, Golgi complexes and vesicles formed within the Golgi cisternae. Numerous sub-surface cisternae are present beneath the outer plasma membrane of the nerve cell body, and the inner surfaces of these cisternae are studded with ribosomes. Some of the cisternae run tangentially into the cytoplasm of the perikaryon, particularly in the vicinity of the Golgi complexes; both sides of these cisternae are studded with ribosomes. From each neuronal perikaryon arise one or more neurites that contain neurotubules, mitochondria, ribosomes and electron-lucent or dense-cored vesicles. Five types of vesicle have been distinguished on the basis of their size and content. The neurites are unmyelinated and form synapses in the neuropile; the synapses possess features typical of those where mechanical strength is of importance. Three types of sensory receptors have been observed in H. nana, two ciliated and one non-ciliated; the latter typically form double or triple nerve endings which terminate within the tegument.
利用透射电子显微镜对微小膜壳绦虫头节和颈部区域的神经系统精细结构进行了研究。本文介绍了该虫这些区域的大体神经解剖结构。神经节、神经连合和神经索由神经细胞体的不完整皮质和神经纤维核心组成。没有界定鞘或被膜。神经细胞体含有一个单核仁的单细胞核、线粒体、许多核糖体、高尔基体和在高尔基池内形成的囊泡。在神经细胞体的外质膜下方存在许多表面下池，这些池的内表面布满核糖体。一些池切向延伸到核周细胞质中，特别是在高尔基体附近；这些池的两侧都布满核糖体。从每个神经元核周发出一个或多个神经突，其中含有神经微管、线粒体、核糖体以及电子透明或致密核心的囊泡。根据大小和内容物区分出了五种类型的囊泡。神经突无髓鞘，在神经纤维网中形成突触；这些突触具有机械强度重要的典型特征。在微小膜壳绦虫中观察到三种类型的感觉感受器，两种有纤毛，一种无纤毛；后者通常形成双或三联神经末梢，终止于皮层内。
