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invagination

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invagination


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Invagination  \In*vag`i*na"tion\,  n.  [L.  pref.  in-  +  vagina 
  sheath.] 
  1.  (Biol.)  The  condition  of  an  invaginated  organ  or  part 
 
  2.  (Biol.)  One  of  the  methods  by  which  the  various  germinal 
  layers  of  the  ovum  are  differentiated. 
 
  Note:  In  embolic  invagination,  one  half  of  the  blastosphere 
  is  pushed  in  towards  the  other  half,  producing  an 
  embryonic  form  known  as  a  gastrula.  --  In  epibolic 
  invagination,  a  phenomenon  in  the  development  of  some 
  invertebrate  ova,  the  epiblast  appears  to  grow  over  or 
  around  the  hypoblast. 
 
  From  WordNet  r  1.6  [wn]: 
 
  invagination 
  n  :  the  folding  in  of  an  outer  layer  so  as  to  form  a  pocket  in 
  the  surface  [syn:  {intussusception},  {infolding}] 




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