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.
Nationality: United States. Executive summary: Creator of The Far Side. Gary Larson grew up in a blue collar household in a blue-collar city, Tacoma, Washington. He played jazz guitar and worked in a music store, and in 1976 he sent six cartoons to Pacific Search, a regional science and nature magazine.