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a rudimentary vertebra that lies in front of the atlas in some animals; sometimes seen in humans as an anomaly in the lower posterior part of the skull.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
proatlas(prō-ăt′lăs) [″ + atlas, a support]
A rudimentary vertebra in front of the atlas of small animals. It may be present as an anomaly in the understructure of the occipital bone in humans.
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