Every October 15 we celebrate World Anatomy Day. It marks the day Andreas Vesalius, the father of modern anatomy, died in 1564. The story of Vesalius starts with the man he corrected, just as the story of Primal is grounded in ensuring anatomical accuracy.
Galen, the authority
Galen was born in Pergamon in 129 CE. He settled in Rome and eventually served as personal physician to several emperors. He saw anatomy as the foundation of medicine and dissected Barbary apes, pigs, sheep, and goats. A social taboo kept him from dissecting humans, so he inferred human anatomy from animals. But those inferences often led to error.
Vesalius, the editor who checked
Vesalius knew Galen’s work as well as anyone. He helped prepare an edition of Galen’s collected works. But he also dissected human bodies, and the texts didn’t match what he found.
The net that wasn’t there
The rete mirabile, or “wonderful net,” played a crucial role in Galen’s anatomy and physiology. It’s an arterial network at the base of the brain. Sheep, pigs, oxen, and other animals have one. Humans don’t.
Vesalius drew it anyway. His 1538 Tabulae anatomicae sex still viewed the body through Galen’s eyes. It included the rete mirabile and a five-lobed liver. In Fabrica, five years later, he corrected himself.
Vesalius corrected his own work as readily as Galen’s. That habit built modern anatomy.
A modern correction
Ajith George is a head and neck surgeon and teaches surgery to trainees in the UK.
“I was using 3D anatomy apps already,” he says about his work before discovering Primal. “The animations look good, but the detail was lacking, particularly for this one area, which is the transoral surgery details.”
One platform showed the hypoglossal nerve deep to the hyoglossus muscle. But the nerve actually runs superficial to it, along the muscle’s lateral surface. For a surgeon teaching trainees who will operate on the submandibular gland, that error carries real consequences.
“If you falsely think it’s deeper to hyoglossus, then you’re going to inadvertently injure it,” he says. “So I can’t share that model with my trainees and say use this as an example, because it’s just wrong.”
George switched to Anatomy.tv, built from real-scan human data and the Visible Human Project, for precision: “Primal was accurate. It was detailed.”
The work continues
Vesalius checked Galen. Then he checked himself. Primal has built anatomy content for more than 35 years with the same integrity. Our anatomists continuously review our models for inaccuracies to ensure they stay the most accurate and detailed anatomical resources in the market. We make updates — though infrequent — when necessary, such as adding details from new discoveries. On World Anatomy Day this year, we honor the anatomists who made checking the standard.