Burke R D
Cell Tissue Res. 1978 Jul 27;191(2):233-47. doi: 10.1007/BF00222422.
Tissues that have the ultrastructural characteristics of nervous tissues are associated with ciliary and muscular elements of the pluteus larva of Strongylocentrotus purpuratus. The nerve cells are found along the margins of the ciliary bands, which are composed predominantly of spindle-shaped ciliated cells. The nerve cells contribute axonal processes to a tract of axons, which runs at the base of the ciliary band throughout its length. Axonal tracts, in the esophagus, lie beneath the circumesophageal muscles. Branched microvilli, which have been interpreted as sensory receptors, are located on the oral side of the main ciliary band and connect with the nerve cells in the ciliary band. The nervous structures described here, and other tissues of the pluteus that have been previously described as nervous, are compared on the basis of their association with receptor and effector organs, and their ultrastructural characteristics.
具有神经组织超微结构特征的组织与紫海胆长腕幼虫的纤毛和肌肉成分相关。神经细胞沿着纤毛带的边缘分布，纤毛带主要由纺锤形的纤毛细胞组成。神经细胞向一束轴突贡献轴突突起，这束轴突在纤毛带基部贯穿其全长。食管中的轴突束位于围食管肌下方。已被解释为感觉受体的分支微绒毛位于主纤毛带的口侧，并与纤毛带中的神经细胞相连。本文描述的神经结构以及先前被描述为神经组织的长腕幼虫的其他组织，根据它们与受体和效应器器官的关联以及超微结构特征进行了比较。
