Centrolecithal

Centrolecithal

Centrolecithal (Greek kentron = center of a circle, lekithos = yolk) is the placement of the yolk in the centre of the cytoplasm of ovums. Many arthropod eggs are centrolecithal.

During cytokinesis, centrolecithal zygotes undergo meroblastic cleavage, where the cleavage plane extends only to the accumulated yolk and is superficial. This is due to the large dense yolk found within centrolecithal eggs and triggers a delayed embryonic development.

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References


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  • centrolecithal — cen tro*lec i*thal (s[e^]n tr[ o]*l[e^]s [i^]*thal), a. [Gr. ke ntron center + le kiqos yolk of an egg.] (Biol.) Having the food yolk placed at the center of the ovum, segmentation being either regular or unequal. Balfour. [1913 Webster] …   The Collaborative International Dictionary of English

  • centrolecithal egg — centrolecithal egg. См. центролецитальное яйцо. (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.

  • centrolecithal — /sen troh les euh theuhl/, adj. Embryol. having a centrally located yolk, as certain insect eggs or ova. [1875 80; CENTRO + LECITHAL] * * * …   Universalium

  • centrolecithal — Denoting an ovum in which the deutoplasm accumulates centrally. [centro + G. lekithos, yolk] * * * cen·tro·lec·i·thal .sen trō les ə thəl adj of an egg having the yolk massed centrally and surrounded by a thin layer of clear cytoplasm compare… …   Medical dictionary

  • centrolecithal — adj. having a central yolk (Embryology) …   English contemporary dictionary

  • centrolecithal — cen·tro·lec·i·thal …   English syllables

  • centrolecithal — |sen.(ˌ)trō|lesəthəl adjective Etymology: centr + Greek lekithos yolk of an egg + English al of arthropod eggs : having the yolk massed centrally and surrounded by a thin layer of clear cytoplasm * * * /sen troh les euh theuhl/, adj. Embryol.… …   Useful english dictionary

  • centrolecithal egg — (ARTHROPODA) A type of arthropod egg in which the nucleus is located centrally in a small amount of nonyolky cytoplasm surrounded by a large mass of yolk until fertilized; when nuclear divisions begin the nuclei migrate to the periphery to… …   Dictionary of invertebrate zoology

  • центролецитальное яйцо — centrolecithal egg центролецитальное яйцо. Яйцо, в котором желток равномерно распределен по всей цитоплазме за исключением ее периферического слоя (периплазмы) и цитоплазматического островка с ядром. (Источник: «Англо русский толковый словарь… …   Молекулярная биология и генетика. Толковый словарь.

  • mesolecithal — |me]zō, |mē], ]sō+ adjective Etymology: mes + lecithal (as in centrolecithal) : centrolecithal * * * /mez euh les euh theuhl, mes , mee zeuh , seuh /, adj. Embryol. centrolecithal. [MESO + LECITHAL] …   Useful english dictionary

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