Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.

Last updated: Jul 2nd, 2025

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The arm bud is part of the embryo and will begin to develop around the fourth week of gestation. The arm buds are recognizable as small swellings on lateral body walls.

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