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n.1.(Anat.) A vertebral rudiment in front of the atlas in some reptiles.
References in periodicals archive ?
The latter process is especially important for the proatlas, whose corpus forms the tip of the dens axis called the Ossiculum terminale Bergmann.
The Company's ProAtlas Series of digital maps for consumers has the number one market share in Japan.
It has come to be known as the proatlas and constitutes the main portion of the odontoid process.