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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.
All plant cells are characterized by several common features, such as chloroplasts, a cell wall, and a large vacuole. These features also differentiate plant cells from animal cells. In addition, there is a number of specialized types of plant cells that are found only in vascular plants. These include parenchyma cells, collenchyma cells, and sclerenchyma cells. 1. Parenchyma cells. The term parenchyma is derived from the Greek word para, which means âbesideâ, and en + chein, meaning âto pour inâ.