The axial endoskeleton notochord are called chorda dorsalis. It is elongated ,narrow ,cylindrical rod-like structures from tip to tail. It lies mid-dorsally at gut and nerve cord. The notochord is surrounded by a laminated fibrous connective tissue notochordal sheath covered by a thin elastic membrane. The elasticity of notochord bending body movement but its rigidly prevents shortening of body when longitudinal muscles contract locomotion.
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