Definition of primitive segment
: any one of the transverse segments into which the body of the embryo of vertebrates becomes marked off by the formation beginning first in the neck region of a series of distinctly limited masses of mesoblast cells on each side of the neural tube
— called also protovertebra
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“Primitive segment.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/primitive%20segment. Accessed 24 Feb. 2021.
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