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Notochord


notochord
rodlike structure in the dorsal (back) side that is the forerunner of the backbone
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Notochord
[Gr. noton - back; Gr. chorde - guts, string]. Rod-like structure originating from mesoderm and lying dorsal to the gut, defining the anterior/posterior axis in the developing embryo. It provides skeletal support during early development.
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notochord
dorsal hollow nerve cord
post-anal tail, and
a series of paired branchial grooves.
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notochord In chordates, a cellular rod that runs the length of the body and provides dorsal support. Also, a structure of mesoderm in the embryo that will become the vertebrae of the spinal column.
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notochord -- Characteristic of chordates, the notochord is a stiff rod of tissue along the back of the body. In vertebrates, the backbone is deposited around the notochord and nerve cord.
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notochord: a flexible rod of tissue extending the length of an animal that provides internal support.
nucleic acids: large molecules comprised of nucleotides.
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notochord
(no-toh-kord) [Gk. noto, back + L. chorda, cord]
A longitudinal, flexible rod formed from dorsal mesoderm and located between the gut and the nerve cord in all chordate embryos.
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notochord An elongated cellular cord, enclosed in a sheath, which forms the primitive axial skeleton of chordate embryos and adult cephalochordates.
notopodium Lobe of parapodium nearer the dorsal side in polychaete annelids.
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notochord - rigid cartilaginous rod found at the dorsal midline in all chordate embryos (it is their defining feature) derived from dorsal mesoderm (chordamesoderm). In vertebrates, it is typically a transient embryonic structure.
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Normally what is supposed to happen is the neuroepithelium is basically a sheet where all the cells are the same and it overlies the notochord, which is at the midline.
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During vertebrate embryo development, structures called the notochord and the floor plate secrete a gradient of the signaling molecule Sonic hedgehog (Shh), ...
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block of dorsal mesodermal cells adjacent to the notochord during vertebrate organogenesis.
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Neurulation is the development of the nervous system in the embryo, at the thickened area above the notochord in ectoderms. The neural plate will fold to produce the neural tube which will develop into the brain.
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: A major phylum in the Kingdom
Animalia
. A chordate is characterized by the presence of a dorsal notochord at some stage of development and a dorsal hollow nerve chord.
Chromatid ...
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The Ciona genome is one of the smallest and most compact of all chordate genome and Ciona tadpole represents the most simplified chordate body plan (the ciona notochord contain only 40 cells).
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