Topic: notochord

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notochord

The Columbia Encyclopedia, Sixth Edition
notochord , in biology, supporting rod running most of the length of animals of the phylum Chordata and present at varying times in the life cycle. Composed of large cells packed within a firm connective tissue sheath, the notochord lies between the neural tube (spinal cord) and the gut. The division of the phylum Chordata into subphyla is based on the structure of the notochord and the time of life in which it is present: In the subphylum Urochordata (tunicates) the notochord characterizes the larval, swimming, stage of the animals and does not extend into the head; in the subphylum Cephalochordata... Read more
skeletagenous septum
A Dictionary of Zoology ... septum One of a series of segments which develop along the notochord and are separated by myosepta . Septa occur in two planes ... plate-like processes which grow dorsally and ventrally to the notochord; horizontal septa bisect this plane perpendicularly. Mesenchymal ... Read more
somite
A Dictionary of Zoology ... paired blocks of mesoderm tissue longitudinally flanking the notochord . There are three distinct tissues within a somite: the dermatome ... voluntary muscle; and the sclerotome which occurs close to the notochord and gives rise to the vertebrae . See also METAMERIC SEGMENTATION ... Read more

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