01 n. One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part o…
pl.
Protovertebræ
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1.
One of the primitive masses, or segments, into which the mesoblast of the vertebrate embryo breaks up on either side of the anterior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm.(Anat.) See: Ectoderm