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pronucleusmore about pronucleus

pronucleus


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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. 
 
  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. 




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