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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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	A high-affinity hemoglobin is expressed in the notochord of amphioxus, Branchiostoma californiense. The Biological Bulletin; 12/1/1998; Bishop, Jamie J. Vandergon, Thomas L. Green, David B. Doeller, Jeannette E. Kraus, David W.; 787 words ; ... spectra characteristic of Hb from the notochord of amphioxus from the Gulf of Mexico ... recorded characteristic Hb spectra from both notochord and myotome tissue of another species ... chevron-shaped bundles of cells, and the notochord tissue consists of a lamellar structure ... Read more
	A Novel Murine Gene, Sickle tail, Linked to the Danforth's short tail Locus, Is Required for Normal Development of the Intervertebral Disc Genetics; 1/1/2006; Semba, Kei; Araki, Kimi; Li, Zhengzhe; Matsumoto, Ken-ichirou; Et al; 787 words ; ... of a reporter gene was detected in the notochord during embryogenesis and in the nucleus ... annulus fibrosus in all IVDs. The Skt gene maps to the proximal part of mouse chromosome ... the third intron of the Skt gene. THE notochord is an integral component of the axial ... CHIANG et eZ.1996). In addition, ... Read more
	Mechanisms of specification in ascidian embryos.(Genetic Regulatory Networks in Embryogenesis and Evolution) The Biological Bulletin; 12/1/1998; Satoh, Noriyuki; 787 words ; ... organs, nerve cord, endoderm, mesenchyme, notochord, and muscle (2). The lineage of these ... initiation site (9). Specification of notochord Recent studies have revealed an important ... embryonic tissue. Differentiation of ascidian notochord cells is induced during the early phase ... Read more
	To the editor Natural History; 8/1/1996; Anonymous; 432 words ; Striking a Notochord Reading about the Museum's new Hall of Vertebrate Origins ("Origins ... have a spinal chord, But it had a lot of gill slits, and it had a notochord! (Chorus) It's a long way from Amphioxus It's a long way to us. It ... Read more
	KNOW-IT-ALLS; GLOSSARY The Milwaukee Journal Sentinel; 4/30/2007; 44 words ; Notochord Cartilaginous rod in an embryo that runs from head to tail and supports the nerve cord. Copyright 2007, Journal Sentinel Inc. All rights reserved. (Note: This notice does not apply to those news items already copyrighted and received through wire services or other media.) Read more
	Upper cervical spine chordoma: a case study. Journal of Neuroscience Nursing; 10/1/2003; Strayer, Andrea; 787 words ; ... locally aggressive tumors. Predominantly found in people 50-69 year old, a chordoma arises found remnants of the primitive notochord. It is most often found in the sacro-coccygeal or skull base areas. However, it can be found throughout the spine. Because ... Read more
	Splashdown. (Letters).(Letter to the Editor) Science News; 12/14/2002; Eagan, J. Roger; 88 words ; ... zoology class. What makes a sea squirt a chordate is the notochord in the animal's larval stage. A notochord is a skeletal component, not a primitive nerve cord. J. ROGER ... QUEENSBURY, N.Y. SEND COMMUNICATIONS TO: Editor, Science News 1719 N Street, N.W., Washington, D.C. 20036 or editors@sciencenews ... Read more
	Extra-axial chordoma Journal of Bone and Joint Surgery; 9/1/2006; van Akkooi, A C J; van Geel, A N; Bessems, J H J M; Bakker, M A den; 787 words ; ... develops from remnants of the embryonic notochord.1,2 Exceptionally, a tumour with an essentially ... showed no sign of disease. Discussion The notochord is an axial mesodermal tissue element ... different parts of the body where the notochord has regressed, such as the sacrococcygeal ... Read more
	Evolutionary implications of FGF and distal-less expressions during proximal-distal axis formation in the ampulla of a direct-developing ascidian, Molgula pacifica. (fibroblast growth factor) The Biological Bulletin; 6/1/1998; Bates, William R.; 787 words ; ... earlier in ascidian development (11). When notochord progenitor cells were isolated from embryos ... descendants of these cells expressed a notochord-specific protein, termed Not-1. Although ... that FGF2 receptors may be present in notochord cells of indirect-developing embryos ... Read more
	Neck pain: common complaint, uncommon diagnosis--symptomatic clival chordoma.(Case Report) Southern Medical Journal; 1/1/2004; Alvarado, Ricardo Gomez, John Morale, Samuel G. Davis, Charles P.; 787 words ; ... from the embryologic remnants of the notochord, the nucleus pulposus. Arising along ... thought to arise from the remnants of the notochord, an embryologic structure that precedes ... the axial skeleton. (2) Remnants of the notochord are found in the nucleus pulposus and ... Read more

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