Parenchyma

Parenchyma

Parenchyma is a term used to describe a bulk of a substance. It is used in different ways in animals and in plants.

The term is New Latin, from Greek "parenkhuma", visceral flesh, from "parenkhein", to pour in beside : para-, beside + en-, in + khein, to pour. [eMedicineDictionary|Parenchyma]

In animals

The "parenchyma" are the "functional" parts of an organ in the body. [ [http://www.siumed.edu/~dking2/intro/glands.htm#7 SIU SOM Histology GI ] ] This is in contrast to the stroma, which refers to the "structural" tissue of organs, being exactly, connective tissues.

In cancer the parenchyma refers to the actual mutant cells of a single lineage, while the stroma is the surrounding connective tissue and associated cells which support it.

The mesodermal layer of the embryo develops into a loose collection of cells known as parenchyma tissue. This tissue occupies the entire space between the outer body wall and the endoderm of the gut.

Examples include:

In plants

"Parenchyma cells" are thin-walled cells of the ground tissue that make up the bulk of most nonwoody structures, yet sometimes their cell walls can be lignified. Parenchyma cells in between the epidermis and pericycle in a root or shoot constitute the cortex, and are used for storage of food. Parenchyma cells within the center of the root or shoot constitute the pith. Parenchyma cells in the ovary constitutes the nucellus and are brick-like in formation. Parenchyma cells in the leaf constitute the mesophyll; they are responsible for photosynthesis and they allow for the interchange of gases [ [http://www.botany.uwc.ac.za/sci_ed/grade10/anatomy/leaves.htm Leaves ] ] .

References


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Look at other dictionaries:

  • parenchyma — pa*ren chy*ma (p[.a]*r[e^][ng] k[i^]*m[.a]), n. [NL., from Gr. pare gchyma, fr. paregchei^n to pour in beside; para beside + en in + chei^n to pour: cf. F. parenchyme.] (Biol.) The soft cellular substance of the tissues of plants and animals,… …   The Collaborative International Dictionary of English

  • parenchyma — parenchyma. См. паренхима. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Parenchȳma — (gr.), 1) das Gewebe, woraus Drüsen u. Eingeweide, bes. dichte Substanz, wie Leber, Nieren, gebildet sind, in denen keine eigentliche muskulöse Bildung unterschieden wird. Daher Parenchymatös, von solcher Bildung; 2) die zwischen der Rinde u. dem …   Pierer's Universal-Lexikon

  • parenchyma — (n.) 1650s, Modern Latin, from Gk. parenkhyma something poured in beside, from para beside (see PARA (Cf. para )) + enkhyma infusion. In ancient physiology, the stuff that was supposed to make up the liver, lungs, etc., which was believed to be… …   Etymology dictionary

  • parenchyma — [pə reŋ′ki mə, pəren′ki mə] n. [ModL < Gr, anything poured in beside < para , beside (see PARA 1) + enchyma, infusion < enchein, to pour in < en , in + cheein, to pour: see FOUND3] 1. Anat. the essential or functional tissue of an… …   English World dictionary

  • Parenchyma — The key elements of an organ essential to its functioning, as distinct from the capsule that encompasses it and other supporting structures. The parenchyma is thus opposed to the connective tissue framework, or stroma, of an organ. The parenchyma …   Medical dictionary

  • parenchyma — parenchymal, parenchymatous /par euhng kim euh teuhs/, adj. /peuh reng keuh meuh/, n. 1. Bot. the fundamental tissue of plants, composed of thin walled cells able to divide. 2. Anat., Zool. the specific tissue of an animal organ as distinguished… …   Universalium

  • Parenchyma — funkcinis audinys statusas T sritis histologija atitikmenys: lot. Parenchyma ryšiai: platesnis terminas – bendrieji terminai sinonimas – parenchyma …   Medicininės histologijos ir embriologijos vardynas

  • parenchyma — pa•ren•chy•ma [[t]pəˈrɛŋ kə mə[/t]] n. 1) bot the fundamental tissue of plants, composed of thin walled cells able to divide 2) anat. zool. the functional tissue of an animal organ as distinguished from its connective or supporting tissue 3) zool …   From formal English to slang

  • Parenchyma — audinys, atliekantis organui būdingą funkciją statusas T sritis histologija, ląstelių chemija, histologinė chemija, audinių kultūra atitikmenys: lot. Parenchyma ryšiai: platesnis terminas – pagrindiniai terminai sinonimas – parenchima …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

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