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 vertebræ and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm.
a stiff dorsal rod found in all chordates at some devlopmental stage; the notochord is replaced by the vertebral column in most chordates
the column of cells arising from the axial process.
A line of cells that mark the area where an embryo's spinal cord develops.
Rod-like structure of mesodermal origin found in vertebrate embryos, which participates in the differentiation of the ventral neural tube and in the specification of ventral neurons.
"an elastic skeletal rod lying lengthwise beneath the nerve cord and above the alimentary canal in the embryos or adults of all chordate animals. Its function is to strengthen and support the body and act as a protagonist for the muscles. It is found in both adult and larval lancelets but in adult vertebrates it is largely replaced by the vertebral column" (411).
A rod that forms in the embryonic mesoderm and which establishes the front-to-back orientation of vertebrate embryos. It also initiates the formation of the nervous system, the skeleton and most muscles.
flexible rodlike longitudinal structural element in primitive chordates
(no´ tow kord) [Gr. notos: back + chorde: string] • A flexible rod of gelatinous material serving as a support in the embryos of all chordates and in the adults of tunicates and lancelets.
a flexible rod that runs the length of the back, found in animals that belong to the phylum Chordata.
A longitudinal rod of cells that forms in the least developed chordates and in embryonic stages of more developed chordates.
a mesoderm derived rod-like structure that runs from head to tail in the vertebrate embryo. It lies centrally beneath the future central nervous system.
(= axial mesoderm) rod of cells lying in trilaminar embryo mesoderm layer ventral to the neural tube, induces neural tube and secretes sonic hedgehog which "ventralizes" the neural tube and also influences somite development. (More? Mesoderm Notes | Neural Notes)
Gr. Noton the back. A rod-shaped body below the primate groove of the embryo probably acting as the inductor for the axial nervous system. In adults it only exists as the nucleus pulposus within the intervertebral disc.
a flexible rod of tissue extending the length of an animal that provides internal support.
In embryology, a rod-shaped body of cells that is the center of development of the axis of the skeleton; also called chorda dorsalis.
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.
the embryonic cartilaginous vertebral column persistent in lampreys, sharks, and rays
a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates
an axial stiffening rod extending along the length of an animal and lying immediately above the alimentary canal
a 'primitive spine' in much of the literature
a rod-like skeletal structure
a rod of living cells ventral to the central nervous system and dorsal to the alimentary canal
a stiff rod of dense tissue
Greek notos = back, and chorde = cord; hence, the primitive axial skeleton around which the vertebrae develop, parts persisting in the nuclei pulposi.
NO-toe-kord A semirigid rod running down the length of an animal's body. 226, 524
n. A flexible rod supporting the bodies of chordate embryos and some adults, but typically replaced in the adult by a bony vertebral column and persisting only as soft disks between each separate vertebra.
An elongated cellular cord, enclosed in a sheath, which forms the primitive axial skeleton of chordate embryos and adult cephalochordates.
A rodlike cord of cells in lower chordates that forms the main lengthwise support structure of the body.
A stiff cartilaginous rod that supports the body and protects the dorsal nerve. The evolutionary precursor of the vertebral column.
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. The stiff rod-like structure that all members of the Phylum Chordata develop at some stage during their life.
The rod-shaped body, comprised of cells from the mesoblast, below the primitive groove of the embryo, defining the primitive axis of the body.
A strip of mesodermal tissue that extends along the back of the developing embryo beneath the neural tube. The structure is replaced by the vertebrae as the baby develops.
A longitudinal, flexible rod formed from dorsal mesoderm and located between the gut and the nerve cord in all chordate embryos.
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.
A rodlike cellular structure running the length of the organisms body which strengthens and supports the body in place of a vertebral column, and supports muscle attachment and bends to support a broad range of locomotory movements. Remains as a cellular structure in protochordates and jawless vertebrates; in jawed vertebrates it is largely or completely replaced during development by cartilage or bony vertabrae. Synapomorphy of the Chordata.
a continuous dorsal rod of cartilaginous material running from the head to the tail. This is perhaps the "defining" characteristic of the chordates. In more derived forms, the notochord is excluded from the head and may become discontinuous, its structural function assumed by serial ossifications, i.e. the vertebrae.
A long, rod-shaped group of cells formed in the mesoderm during gastrulation of the early embryo. The notochord defines the longitudinal axis of the body plan and induces formation of neural tissue in the overlying ectoderm.
A long, flexible rod which runs the length of the back in some kinds of animals (animals that belong to the phylum Chordata). In vertebrates, the notochord develops into part of the backbone.
The notochord is an elastic skeletal rod that runs along the back beneath the nerve cord. It induces the nervous system.
Longitudinal supporting axis of body which is eventually replaced as a support by the vertebral column in teleostean fishes.
flexible rod of embyronic tissue that lies where the future vertebral column will develop
A long flexible rod of cells that provides the supporting axis of an organism’s body
The notochord is a flexible, rod-shaped body found in embryos of all chordates. It is composed of cells derived from the mesoderm and defining the primitive axis of the embryo. In lower vertebrates, it persists throughout life as the main axial support of the body, while in higher vertebrates it is replaced by the vertebral column.