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.
Like us on Facebook. For 15 years, The Far Side added a dash of irreverence to the funny pages. Offbeat, macabre, and sometimes controversial, Gary Larsonâs trailblazing cartoon was a gigantic success that ran in nearly 2000 newspapers at the height of its popularity.