notochord


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notochord

 [no´to-kord]
a cylindrical cord of cells on the dorsal aspect of an embryo, marking its longitudinal axis; the common factor of all chordates. It is the center of development of the axial skeleton.

no·to·chord

(nō'tō-kōrd),
1. In primitive vertebrates, the primary axial supporting structure of the body, derived from the notochordal or head process of the early embryo; an important organizer for determining the final form of the nervous system and related structures.
2. In embryos, the axial fibrocellular cord about which the vertebral primordia develop; vestiges of it persist in the adult as the nuclei pulposi of the intervertebral discs. Synonym(s): chorda dorsalis
[G. nōtos, back, + chordē, cord, string]

notochord

/no·to·chord/ (nōt´o-kord) a rod-shaped cord of cells on the dorsal aspect of an embryo, defining the primitive axis of the body and serving as the center of development of the axial skeleton; it is the common factor of all chordates.

notochord

(nō′tə-kôrd′)
n.
A flexible rodlike structure that is present in the embryos of all chordates and in the adult forms of certain groups, such as the lancelets and hagfishes. The notochord develops into the spinal column in most vertebrates.

no′to·chord′al adj.

notochord

[nō′tōkôrd]
Etymology: Gk, noton, back, chorde, cord
an elongated strip of mesodermal tissue that originates from the primitive node and extends along the dorsal surface of the developing embryo beneath the neural tube, forming the primary longitudinal skeletal axis of the body of all chordates. In humans and other higher vertebrates, the structure is replaced by vertebrae, although a remnant of it remains as part of the nucleus pulposus of the intervertebral disks. See also neural tube. notochordal, adj.

no·to·chord

(nō'tō-kōrd)
1. In primitive vertebrates, the primary axial supporting structure of the body, derived from the notochordal or head process of the early embryo; an important organizer for determining the final form of the nervous system and related structures.
2. In embryos, the axial fibrocellular cord about which the vertebral primordia develop; vestiges of it persist in the adult as the nuclei pulposi of the intervertebral discs.
[G. nōtos, back, + chordē, cord, string]

notochord

A rod-like structure, present in early development, derived from the MESODERM and giving rise to the spine. In the adult, the notochord is represented by the pulpy centres (nucleus pulposus) of the intervertebral discs.

notochord

the longitudinal axial support (skeleton) of the embryos of all chordates, which lies ventral to the nerve cord and dorsal to the alimentary canal. Remnants of the notochord usually remain in the adult between the vertebrae, which come to surround it.

no·to·chord

(nō'tō-kōrd)
In embryos, the axial fibrocellular cord about which vertebral primordia develop; vestiges persist in the adult as the nuclei pulposi of the intervertebral discs.
[G. nōtos, back, + chordē, cord, string]

notochord (nō´təkôrd´),

n an elongated strip of mesodermal tissue that originates from the primitive node and extends along the dorsal surface of the developing embryo beneath the neural tube, forming the primary longitudinal skeletal axis of the body of all chordates.

notochord

a cylindrical cord of cells on the dorsal aspect of an embryo, marking its longitudinal axis; a defining characteristic of all chordates. It is the center of development of the axial skeleton. Its remnants in adult mammals are found in the pulpy centers of the intervertebral disks.
References in periodicals archive ?
In chick embryos, it has been shown that the adjacent notochord allows the Pdx1 expression, thereby inducing the budding of the dorsal pancreas by deactivating the sonic hedgehog expression coming from the dorsal foregut epithelium (36).
Chordomas are rare, slow-growing malignant yet locally aggressive osteolytic primary bone tumours derived from intraosseous remnants of embryonic notochord principally arising in the midline.
Muscular contractions in the zebrafish embryo are necessary to reveal thiuram-induced notochord distortions.
Notochord is important in the induction of thoracic and abdominal viscera as well as the neural tube.
Persistence of canal on basilar part of clivus is a rare congenital defect of skull base representing an embryological remnant depicting the cephalic end of the notochord and corresponds to the course of the notochordal canal in the basiocciput caudally.
Antonella Lauri and Thibaut Brunet, both in Arendt's lab, identified the genetic signature of the notochord -- the combination of genes that have to be turned on for a healthy notochord to form.
Differentiation of human ES cell-derived neural progenitors to neuronal cells with regional specific identity by co-culturing of notochord and somite.
At the end of the third week, the notochord initiates the differentiation of ectodermal cells into specialised neuro-ectoderm and the neural plate subsequently folds to form a tube.
1 mm: standard length (SL--measurement from the tip of the snout to the tip of the notochord or posterior tip of hypural plates); head length (HL --measurement from tip of snout to end of operculum); eye diameter (measurement taken along widest part of eye); snout length (measurement from tip of snout to anterior edge of eye); body depth (vertical measurement taken at the pectoral-fin base); body depth at the anus (vertical measurement taken at the anus); snout to anus length (preanal length); snout to anal-fin origin; and snout to dorsal-fin origin.
The radii extend from the perimeter of the centrum, inward toward the notochord for a distance of one-half the radius.
Split notochord theory' proposes neural tube traction mechanism behind enteric duplication associated with vertebral anomalies.
Notochord is straight, mouth is closed, body has blood circulation and blood flows in two main vessels through heartbeat.