Dictionary » N » Notochord

Notochord

notochord

(Science: embryology) An axial mesodermal tissue found in embryonic stages of all chordates and protochordates, often regressing as maturity is approached. Typically a rod shaped mass of vacuolated cells. It lies immediately below the nerve cord and may provide mechanical strength to the embryo.


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Please check my work?

... D mouths, protosomes, body symmetry is it C? ------ Which of the following is NOT a characteristic shared by all chordates? A solid nerve cord B notochord C postanal tail D pharyngeal pouches A? Members of the subphyla Urochordata and Cephalochordata are chordates although they lack A a backbone. ...

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by radicali
Thu Jun 14, 2012 8:57 pm
 
Forum: General Discussion
Topic: Please check my work?
Replies: 1
Views: 2278

Re: Vertebrates and invertebrates

... thyroid gland in the more derived forms) Post Anal Tail (though some have lost theirs, though a vestigial structure usually still remains) Notochord (for movement or other functions in other chordates) Pharyngeal slits (become a variety of other structures like gills) Dorsal Nerve Chord ...

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by Chroma
Fri Dec 11, 2009 9:26 am
 
Forum: Zoology Discussion
Topic: Vertebrates and invertebrates
Replies: 11
Views: 10362

Vertebrates and invertebrates

Oh, and the vast majority of vertebrates only have a notochord in the early embryo stage - it kind of causes the formation of the brain and spinal cord, then breaks down.

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by Darby
Thu Dec 10, 2009 5:58 pm
 
Forum: Zoology Discussion
Topic: Vertebrates and invertebrates
Replies: 11
Views: 10362

Vertebrates and invertebrates

a vertebrate is any animal with a stiff vertebral column present. Both vertebrates and invertebrates have a notochord: a flexible stiffening rod that they retain as adults

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by nova707
Sat Dec 05, 2009 8:15 pm
 
Forum: Zoology Discussion
Topic: Vertebrates and invertebrates
Replies: 11
Views: 10362

Cells positioning

... cell groups, development of different cell layers (germ layers) and formation of some crucial body structures such as the neural tube and the notochord in chordate animals. Until this and even bit further, all vertebrates follow a very identical developmental path. How the eyes end up in the ...

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by biohazard
Mon Nov 09, 2009 9:47 am
 
Forum: General Discussion
Topic: Cells positioning
Replies: 7
Views: 3670
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