I believe this is a case of pareidolia.

While I believe it is credible, Michaelangelo would have seen dissected corpse, I don't think a brain cross section would have been that detailed at that time.

Looking at Da Vinci sketch below, it does not look that similar anymore :

https://neurosciencenews.com/da-vinci-brain-knowledge-11070/

Never noticed that, thank you for pointing it out. There is a lot of evidence for Michaelangelo dissecting corpses with the tacit approval of the church, it made his art stand out substantially because of his knowledge of the muscles and bones underlying the skin and the fabric.

I share your curiosity: Who on earth would downvote this? Quirky, interesting new titbit for our collection of trivia and learned matter, thank you.

Probably because of the source (Cracked.com, a humor site, albeit one which does often share interesting knowledge in a quirky way). Downvoters could be reading the post as a joke rather than in earnest.

Apparently it is a legitimate published theory, as noted in Wikipedia: https://en.wikipedia.org/wiki/The_Creation_of_Adam#Portrayal... So is the theory that the shape represents the postpartum uterus, which seems thematically more fitting.

That would be my fault. I just googled for an image.

HN is a strange place