notochord - ορισμός. Τι είναι το notochord
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Τι (ποιος) είναι notochord - ορισμός

FLEXIBLE ROD-SHAPED BODY FOUND IN EMBRYOS OF ALL CHORDATES
Notogenesis; Notocord; Notchrod; Notochordata
  • spotted African lungfish]] showing the notochord

Notochord         
·noun An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebrae and the posterior part of the base of the skull are developed; the chorda dorsalis. ·see ·Illust. of Ectoderm.
notochord         
['n??t?(?)k?:d]
¦ noun Zoology a cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.
Origin
C19: from Gk noton 'back' + chord2.
Notochord         
In anatomy, the notochord is a flexible rod which is similar in structure to the stiffer cartilage. If a species has a notochord at any stage of its life cycle (along with 4 other features), it is, by definition, a chordate.

Βικιπαίδεια

Notochord

In anatomy, the notochord is a flexible rod which is similar in structure to the stiffer cartilage. If a species has a notochord at any stage of its life cycle (along with 4 other features), it is, by definition, a chordate. The notochord consists of inner, vacuolated cells covered by fibrous and elastic sheaths, lies along the anteroposterior axis (front to back), is usually closer to the dorsal than the ventral surface of the embryo, and is composed of cells derived from the mesoderm.

The most commonly cited functions of the notochord are: as a midline tissue that provides directional signals to surrounding tissue during development, as a skeletal (structural) element, and as a vertebral precursor.

In lancelets the notochord persists throughout life as the main structural support of the body. In tunicates the notochord is present only in the larval stage, being completely absent in the adult animal. In these invertebrate chordates, the notochord is not vacuolated. In all vertebrates other than the hagfish, the notochord is integrated into the vertebral column, with its original structure being (nearly) retained in the intervertebral discs as the nucleus pulposus.