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protovertebra 原椎 原椎 Protovertebra \Pro`to*ver"te*bra\, n.; pl. {Protovertebr[ae]} .
[Proto- vertebra.] (Anat.) 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}. [1913 Webster] Note: The protovertebr[ae] were long regarded as rudiments of the permanent vertebr[ae], but they are now known to give rise to the dorsal muscles and other structures as well as the vertebral column. See {Myotome}. [1913 Webster]
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