Michelangelo used images of human Anatomy throughout his work.
At the time, Renaissance scholars were studying human.
Perhaps at the time he made the art, he worried that it was too dangerous for his own person to reveal the secular Anatomy theme.
He was hinting, as the Anatomy was already there in his art.
Michelangelo began his career with extensive dissections of human corpses and ended his career talking about illustrating an Anatomy book.
Nearly the entire body is there, albeit in pieces.
Michelangelo used images of human Anatomy throughout his work