Why was Andreas Vesalius able to describe the human body accurately

began dissecting corpses for himself to show his students the fine details of anatomy

Explanation:

Andreas Vesalius founded modern anatomy. His remarkable 1543 book De humini corporus fabrica was a fully illustrated anatomy of the human body. Based on observations he made during dissections, the book overthrew misconceptions in anatomy that had persisted for over a thousand years.

In 1543, Vesalius published 'De Humani Corporis Fabrica'. The book was based largely on human dissection, and transformed anatomy into a subject that relied on observations taken directly from human dissections. Vesalius now left anatomical research to take up medical practice.

His work was very influential for early modern medicine both because it gave doctors more detailed knowledge of human anatomy and because it encouraged them to investigate critically the claims of ancient medical authorities.

Vesalius widened his scope, dissecting animals, and reading over his Galen more carefully. The source of the mistake dawned on him. Galen had never dissected a human.