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Dorsal nerve cord and notochord: in all seven species • Paired appendages and spinal column: in all species except lamprey • Paired legs: in all species except lamprey and tuna • Amnion: in all species except lamprey, tuna, and bullfrogs • Mammary glands: in kangaroo, rhesus monkeys, and humans only • Placenta: in ...
The notochord provides skeletal support, gives the phylum its name, and develops into the vertebral column in vertebrates. The dorsal hollow nerve cord develops into the central nervous system: the brain and spine.
The dorsal nerve cord is a hollow dorsal cord. It consists of a part of the exfoliated coagulant, forming a hollow tube, compared to other animal species that have solid abdominal tubes. The dorsal nerve cord later changes in vertebrates to the central nervous system, which consists of the brain and spinal cord.Oct 11, 2018
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