Internal and external morphology of adults of the appendicularian, Oikopleura dioica: an SEM study.
Internal and external morphology of adults of the appendicularian, Oikopleura dioica: an SEM study.
复制标题
Oikopleura dioica 成虫的内部和外部形态：扫描电镜研究。
DOI：
10.1007/s00441-016-2524-5
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发表时间：
2017
影响因子：
3.6
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Onuma;T. A.;Isobe;M.;and Nishida;H.
蝌蚪类（Oikopleura dioica）是一种生活在水中的被囊类动物，一生都保持着蝌蚪的形状。它有相对较少的细胞，并表现出快速发展，但它有一个基本的脊索动物的身体计划。在这项研究中，使用扫描电子显微镜（SEM）研究了成虫的形态，并拍摄了大部分器官的精细3D图像。躯干表皮组织成双边领土分泌的房子，包括食物捕获过滤器。咽部分别向鳃口和食道的腹侧和后侧延伸。内柱，具有形态上明显的纤毛带，嵌入咽部。消化道呈左右不对称性，咽与食管的连接处向两侧倾斜。心脏位于左胃和肠之间的腹侧，由左肌层和右薄的非肌层组成。大脑连接到口部和腹侧感觉器官、睫状漏斗和感觉囊泡，轴突从其下降，最终支配尾神经节。在尾部，一条神经索沿着脊索的左侧沿着分布，神经元胞体呈散在分布。生殖腺是由数千个配子组成的单个合胞体。在卵巢中，大量的皮质膜在卵子发生过程中内陷到细胞质中，并且生长中的卵母细胞通过共同的细胞质通过环形通道相互连接。精子发生在共同的细胞质中同步进行。这些描述提供了一个有价值的解剖图谱研究发展和生理学使用这个简单的有机体与脊索动物的身体计划。
The appendicularian,Oikopleura dioica, is a planktonic tunicate that retains a swimming tadpole shape throughout its life. It has relatively few cells and exhibits fast development, yet it has a basic chordate body plan. In this study, the morphology of adults was investigated using scanning electron microscopy (SEM) and fine 3D images of most organs were taken. The trunk epidermis is organized into bilateral territories secreting the house that includes the food-trapping filter. The pharynx extends ventrally and posteriorly to the gill openings and esophagus, respectively. The endostyle, with a morphologically distinct ciliated band, is embedded in the pharynx. The digestive tract showed left–right asymmetry as the connection between the pharynx and esophagus tilts leftward. The heart is located ventrally between the left stomach and the intestine and consists of a left muscular sheet and a right thin, non-muscular sheet. The brain is connected to the oral and ventral sensory organs, ciliary funnels and sensory vesicles and axons descend from it that eventually innervate the caudal ganglion. In the tail, a nerve cord with sporadically distributed neuronal somata runs along the left side of the notochord. The gonad is a single syncytium of thousands of gametes. In the ovary, an abundance of cortical membrane invaginate into the cytoplasm during oogenesis and the growing oocytes are interconnected via common cytoplasm through a ring canal. Spermatogenesis progresses synchronously within the common cytoplasm. These descriptions provide a valuable anatomical atlas for studying development and physiology using this simple organism with a chordate body plan.