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ambulacra

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ambulacra


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Ambulacrum  \Am`bu*la"crum\,  n.;  pl  {Ambulacra}.  [L.,  an  alley 
  or  covered  way.]  (Zo["o]l.) 
  a  One  of  the  radical  zones  of  echinoderms,  along  which  run 
  the  principal  nerves,  blood  vessels,  and  water  tubes. 
  These  zones  usually  bear  rows  of  locomotive  suckers  or 
  tentacles,  which  protrude  from  regular  pores.  In  star 
  fishes  they  occupy  the  grooves  along  the  under  side  of 
  the  rays. 
  b  One  of  the  suckers  on  the  feet  of  mites. 




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