Question

Pronephros Kidney

Explain

Answer 1

Pronephros : Itoriginates from  the  anterior  part  of  the  nephrotome. It  is also  termed head  kidney due  to its anterior  position.  There  are  only  3  pronephrine  tubule  (nephron)  in  frog  embryo,  7  in  human  embryo,  and about  12  in  chick  embryo  which  are  segmentary  arranged.  Nephrostome  present,  glomerulus  is  external and  unite  to  form  glomus  in  some  cases.  Duct  is  pronephric  duct  or  mullerian  duct.  A  pair  of  pronephros appear  in  all  vertebrate  embryos  but  they  becomes  functions  kidneys  in  adult  myxine  and  embryos  of  all anamniotes  (fish,  amphibian).  This  kidney  found  as  transitory  kidney  in  all  vertebrates  embryos.

Answer 2

Mesonephros : It originates from the middle part of the nephrotome. Duct is mesonephric or Wolffian duct. ... In fish and amphibians, tubules extend through length of coelom behind pronephros and formed from entire nephrotome left behind thepronephrus called opisthonephrickidney.

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