notochord
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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Notochord
[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.
The Notochord
The notochord (Fig. 19) consists of a rod of cells situated on the ventral aspect of the neural tube; it constitutes the foundation of the axial skeleton, since around it the segments of the vertebral column are formed.
notochord -- 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.
notochord 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.
notochord
(no-toh-kord) [Gk. noto, back + L. chorda, cord]
A longitudinal, flexible rod formed from dorsal mesoderm and located between the gut and the nerve cord in all chordate embryos.
nuclear envelope ...
notochord - rigid cartilaginous rod found at the dorsal midline in all chordate embryos (it is their defining feature) derived from dorsal mesoderm (chordamesoderm). In vertebrates, it is typically a transient embryonic structure.
notochord
A longitudinal, flexible rod formed from dorsal mesoderm and located between the gut and the nerve cord in all chordate embryos.
notochord
dorsal hollow nerve cord
post-anal tail, and
a series of paired branchial grooves.
notochord An elongated cellular cord, enclosed in a sheath, which forms the primitive axial skeleton of chordate embryos and adult cephalochordates.
notopodium Lobe of parapodium nearer the dorsal side in polychaete annelids.
a notochord: a dorsal supporting rod located dorsally just below the nerve cord; it provides support and is replaced by the vertebral column in vertebrates ...
organism having a notochord at some stage of development - a rigid cartilaginous rod in the back extending from anterior to posterior; this group includes the vertebrates.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Their unique characteristics include (1) a dorsal hollow nerve cord (most other animals have a ventral nerve cord) above the notochord. At its anterior end, the nerve cord becomes enlarged to form the brain.
Normally what is supposed to happen is the neuroepithelium is basically a sheet where all the cells are the same and it overlies the notochord, which is at the midline.
The traits that make all of the animals in this section special are their spinal cords, vertebrae, and notochords. It's all about having a series of nerves along your back (dorsal side).
During vertebrate embryo development, structures called the notochord and the floor plate secrete a gradient of the signaling molecule Sonic hedgehog (Shh), ...
Chordata: A major phylum in the Kingdom Animalia. A chordate is characterized by the presence of a dorsal notochord at some stage of development and a dorsal hollow nerve chord.
 See also: Embryo, Trans, Cells, Organ, Animal
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