Found this thread when I "googled" skull ridges. Like the OP, I discovered my ridge, vertical, along centre of skull-top, when I started shaving head close with a No. 1 blade. Doesn´t bother me, but my wife gently ribs me about it. I always believed it was an evolutionary throwback to our "Robust Australopithecine" ancestors, I think about 2 million years ago, fossils found in Africa in Olduvai Gorge. They had a huge skull ridge to support massive jaw muscles as they were vegetarian and ate lots of tubers, which required lots of chewing.
Imagine my disappointment when I discovered that skull ridges are merely the result of the foetal skull plates beginning to fuse a little too early in the womb. Ridges can occur along the join-lines or sutures of any of the skull bones. Not nearly as cool an explanation as my original one.
But hey, thank you for this forum. It is the coolest thing I´ve found on otherwise (mostly) useless internet in years!
Be bald, be proud!
