The dura mater has two layers, or lamellae: The superficial layer (also called the periosteal layer), which serves as the skull's inner periosteum, called the endocranium; and a deep layer called the meningeal layer; the actual dura mater.
The term thagomizer was coined by Gary Larson in humor, in a 1982 Far Side comic strip, in which a group of cavemen in a faux-modern lecture hall are taught by their caveman professor that the spikes on a Stegosaur's tail are so named after the late Thag Simmons.
My life has been full of terrible misfortunes, most of which never happened.. Michel de Montaigne The Muse's Salon: Greetings from... THE FAR SIDE- Gary Larson, the first cartoonist to make me realise there were people just as strange as me out there.