What is a notochord and name an animal that belonga to phylum protochordata
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The notochord is a long rod like support structure that runs along the back of the animal separating the nervous tissue from the gut.
Balanoglossus belongs to the phylum protochordata
Balanoglossus belongs to the phylum protochordata
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A notochord is a primitive beginning to the backbone. It appears in embryos as a small flexible rod made from cells from the mesoderm, which is one of the three layers of cells of embryos. Notochords are only found in the phylum chordata, a group of animals that includes humans. In fact, it is the defining feature of that particular phylum. Notochords, and furthermore backbones, are what separate us from the more primitive living creatures that we encounter.
The notochord is oriented head to tail and is found between the digestive tube and the nerve cord. Since it is composed of stiffer tissue, it allows for skeletal support of the organism. In certain chordates, like the lamprey and the sturgeon, the notochord remains there for life. In vertebrates, such as humans, a more complex backbone appears with only portions of the notochord remaining. As our backbone fully forms, the discs in our back is where the pieces of notochord are found as a sort of gelatinous material.
The notochord is oriented head to tail and is found between the digestive tube and the nerve cord. Since it is composed of stiffer tissue, it allows for skeletal support of the organism. In certain chordates, like the lamprey and the sturgeon, the notochord remains there for life. In vertebrates, such as humans, a more complex backbone appears with only portions of the notochord remaining. As our backbone fully forms, the discs in our back is where the pieces of notochord are found as a sort of gelatinous material.
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