WordNet

the primary tissue of higher plants composed of thin-walled cells that remain capable of cell division even when mature; constitutes the greater part of leaves, roots, the pulp of fruits, and the pith of stems
animal tissue that constitutes the essential part of an organ as contrasted with e.g. connective tissue and blood vessels

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/01/03 13:54:05」(JST)

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Parenchyma is the bulk of a substance. In animals, a parenchyma comprises the functional parts of an organ and in plants parenchyma is the ground tissue of nonwoody structures.

The term parenchyma is New Latin, f. Greek παρέγχυμα - parenkhuma, "visceral flesh", f. παρεγχεῖν - parenkhein, "to pour in" f. para-, "beside" + en-, "in" + khein, "to pour".^[1]

In plants

Parenchyma (pale grey) in a plant stem, with scattered veins (darker red)

In plants, "parenchyma" is one of the three main types of ground tissue, and the most common. It can be distinguished through their thin cell wall as compared to other cells. Parenchyma cells make up the bulk of the soft parts of plants, including the insides of leaves, flowers and fruits (but not the epidermis or veins of these structures).^[2]

In animals

The parenchyma are the functional parts of an organ in the body. This is in contrast to the stroma, which refers to the structural tissue of organs, namely, the connective tissues.

In the brain, the parenchyma refers to "The functional tissue in the brain. It is comprised of two types of cells, neurons and glial cells, that are used specifically for cognition and controlling the rest of the body."^[3]

Damage or trauma to the brain parenchyma often results in a loss of cognitive ability or even death.

In cancer, the parenchyma refers to "The portion of a tissue that lies outside the circulatory system and is often responsible for carrying out the specialized functions of the tissue".^[4]

References

^ LeMone, Priscilla; Burke, Karen; Dwyer, Trudy; Levett-Jones, Tracy; Moxham, Lorna; Reid-Searl, Kerry; Berry, Kamaree; Carville, Keryln; Hales, Majella; Knox, Nicole; Luxford, Yoni; Raymond, Debra (2013). "Parenchyma". Medical-Surgical Nursing. Pearson Australia. p. G–18. ISBN 978-1-4860-1440-8.
^ "Parenchyma". Retrieved 30 December 2014.
^ http://www.wisegeek.org/what-is-the-brain-parenchyma.htm
^ Weinberg (c. 2014). The Biology of Cancer. ^{[page needed]}

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