vascular strand

1. It does not show sheaths around the vascular bundles. Procambium ( procambial strand) The layer of cells that gives rise to the vascular tissue.
   它并没有显示出在维管束周围的鞘状构造。原形成层（原形成层束）：形成维管组织的一层细胞。
2. The central vascular strand goes through major part of embryo, and in the areas to where the central vascular strand can not extend, there exists a regional conducting system.
   中央维管网贯穿胚体，其盲端区常出现不能与之连通的局部输导组织。

noun

1. a unit strand of the vascular system in stems and leaves of higher plants consisting essentially of xylem and phloem

   Synonym:    vascular bundlefibrovascular bundle