Pronucleus

Pronucleus
Pronucleus Pro*nu"cle*us, n.; pl. {Pronuclei} (-[imac]). [NL. See {Pro-}, and {Nucleus}.] (Biol.) One of the two bodies or nuclei (called male and female pronuclei) which unite to form the first segmentation nucleus of an impregnated ovum. [1913 Webster]

Note: In the maturing of the ovum preparatory to impregnation, a part of the germinal vesicle (see {Polar body}, under {Polar}) becomes converted into a number of small vesicles, which aggregate themselves into a single clear nucleus. which travels towards the center of the egg and is called the female pronucleus. In impregnation, the spermatozo["o]n which enters the egg soon loses its tail, while the head forms a nucleus, called the male pronucleus, which gradually travels towards the female pronucleus and eventually fuses with it, forming the first segmentation nucleus. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • pronucléus — [ pronykleys ] n. m. • 1875; de pro et nucléus ♦ Biol. Noyau haploïde d un œuf fécondé. Pronucléus mâle, femelle. ● pronucléus nom masculin Noyau du spermatozoïde (pronucléus mâle) ou de l ovule (pronucléus femelle). pronucléus [pʀonykleys] n. m …   Encyclopédie Universelle

  • pronucleus — pronucleus. См. пронуклеус. (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.

  • Pronuclĕus — Pronuclĕus, Spermakern, s. Befruchtung …   Meyers Großes Konversations-Lexikon

  • pronucleus — [prō no͞o′klē əs, prōnyo͞o′klē əs] n. pl. pronuclei [prō no͞o′klēī΄, prōnyo͞o′klēī΄] [ModL: see PRO 1 & NUCLEUS] Zool. the haploid nucleus of either the spermatozoon or the ovum which unite in fertilization to form the fused double (or diploid)… …   English World dictionary

  • Pronucleus — A cell nucleus with a haploid set of chromosomes (23 chromosomes in humans) resulting from meiosis (germ cell division). The male pronucleus is the sperm nucleus after it has entered the ovum at fertilization but before fusion with the female… …   Medical dictionary

  • pronucleus — Haploid nucleus resulting from meiosis. In animals the female pronucleus is the nucleus of the ovum before fusion with the male pronucleus. The male pronucleus is the sperm nucleus after it has entered the ovum at fertilization but before fusion… …   Dictionary of molecular biology

  • Pronucleus — The process of fertilization in the ovum of a mouse. A pronucleus (plural: pronuclei) is the nucleus of a sperm or an egg cell during the process of fertilization, after the sperm enters the ovum, but before they fuse. Sperm and egg cells are… …   Wikipedia

  • Pronucleus femininus — patelės probranduolis statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Pronucleus femininus ryšiai: platesnis terminas – apvaisintas kiaušinis …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Pronucleus masculinus — patino probranduolis statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Pronucleus masculinus ryšiai: platesnis terminas – apvaisintas kiaušinis …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Pronucleus femininus — moteriškas probranduolis statusas T sritis embriologija atitikmenys: lot. Pronucleus femininus ryšiai: platesnis terminas – apvaisintas kiaušinėlis …   Medicininės histologijos ir embriologijos vardynas

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”