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1 Parenchyma cells remain alive at maturity and can become meristematic, as in INTERFASCICULAR CAMBIUM (see SECONDARY THICKENING). See Fig. 246 2  . 2 the loose, vacuolated cells that form much of the body tissue of platyhelminths.  3 any specific organ cells apart from connective tissues and blood vessels.
In contrast, paratracheal parenchyma is axial parenchyma in which the cells are obviously associated with the vessels. In the aliform type of paratracheal parenchyma, cells extend tangentially from the vessels and are seen in cross section as lateral wing-like projections. Parenchyma (also referred to as Ground Tissue or Soft Tissue) - Cells in a tissue of a tree that are concerned with function rather than structure.